Question

The third proportional to 9 and 12 is ?
A) 14
B) 16
C) 18
D) 20

Answer 1

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Here is your answer.

Let the third proportional be x.

So,
$9 : 12 : x \\ \\ \frac{9}{12} = \frac{12}{x}$
By cross-multiplication

$9 \times x = 12 \times 12 \\ 9x = 144 \\ \\ x = \frac{144}{9} \\ \\ x = 16$
Therefore, third proportional is
Option B) 16.

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