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Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Addendum

Simpler is

Infix[f[1/2, 3/4], "\[Times]"] // TeXForm
(* \frac{1}{2}\times \frac{3}{4} *)

which also provides the times sign. $$\frac{1}{2}\times \frac{3}{4}$$

Second Addendum

z1 z2 /. Times -> Cross /. {z1 -> 1/2, z2 -> 3/4} // TeXForm

also produces the desired output. (This is based on the third Answer to 39061.)

Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Addendum

Simpler is

Infix[f[1/2, 3/4], "\[Times]"] // TeXForm
(* \frac{1}{2}\times \frac{3}{4} *)

which also provides the times sign. $$\frac{1}{2}\times \frac{3}{4}$$

Second Addendum

z1 z2 /. Times -> Cross /. {z1 -> 1/2, z2 -> 3/4} // TeXForm

also produces the desired output. (This is based on the third Answer to 39061.)

Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Addendum

Simpler is

Infix[f[1/2, 3/4], "\[Times]"] // TeXForm
(* \frac{1}{2}\times \frac{3}{4} *)

which also provides the times sign. $$\frac{1}{2}\times \frac{3}{4}$$

Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Addendum

Simpler is

Infix[f[1/2, 3/4], "\[Times]"] // TeXForm
(* \frac{1}{2}\times \frac{3}{4} *)

which also provides the times sign. $$\frac{1}{2}\times \frac{3}{4}$$

Second Addendum

z1 z2 /. Times -> Cross /. {z1 -> 1/2, z2 -> 3/4} // TeXForm

also produces the desired output. (This is based on the third Answer to 39061.)

Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Use HoldForm applied to each fraction to keep the fractions from combining.

HoldForm[1/2] HoldForm[3/4]

to produce $$ \frac{1}{2} \frac{3}{4} $$

or

HoldForm[(1/2) (3/4)]

to produce $$ \frac{3}{2 \times 4} $$

Using TeXForm produces the desired LaTex code.

(HoldForm[1/2] HoldForm[3/4]) // TeXForm
(* \frac{1}{2} \frac{3}{4} *)

Addendum

Simpler is

Infix[f[1/2, 3/4], "\[Times]"] // TeXForm
(* \frac{1}{2}\times \frac{3}{4} *)

which also provides the times sign. $$\frac{1}{2}\times \frac{3}{4}$$