Question

find the
fourth propositional to :
12, 16, 18.​

Answer 1

Let the fourth proportional to 12,16,18 be X

12 : 16 :: 18 : X

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➡️ 12 x X = 16 x 18( product of extremes = product of means )

➡️X = (16 x 18)/12

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➡️X = 24

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Hence the fourth proportional to 12, 16, 18 is 24