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Question

Find the fourth proportional.
15:20 :: 9:?

A
14
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B
12
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C
7
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D
3
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Solution

The correct option is B 12
Let the fourth proportional be x.
15, 20, 9 and x are proportional.
i.e., 15:20 :: 9:x
15×x=20×9 (Productofextremes=Productofmeans)
x = 20×915
x = 12
Hence the fourth proportional is 12.

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