Grabbing the @eldo's matrix and using SubsetMap:
a = {{2, 3}, {3, 4}, {4, 5}, {5, 6}, {6, 7}};
SubsetMap[#/a[[All, 1]] &, a, {All, 2}]
(*{{2, 3/2}, {3, 4/3}, {4, 5/4}, {5, 6/5}, {6, 7/6}}*)
E. Chan-López
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