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How can I express a decimal such as 0.1845095405274387 as a fraction in its lowest terms?

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Rationalize[0.1845095405274387, 10^-50] ? – Dr. belisarius Jun 20 '12 at 1:07

Another option:

RootApproximant[0.1845095405274387, 1]
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Still another possibility:

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+1 for referencing a non-esoteric function I cannot recall using. – Mr.Wizard Jun 22 '12 at 2:02
I deal with continued fractions somewhat frequently, you see... – J. M. Jun 22 '12 at 2:04

A couple of bits of code for your consideration:

FromDigits@#/10^(Length@# - #2) & @@ RealDigits[0.1845095405274387]

Rationalize[0.1845095405274387, $MachineEpsilon]
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@Mr.Wizard...I Thank you – emmett Jun 20 '12 at 2:08

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