Find the third proportional of $16$ and $20$ .

19

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18

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25

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None of the above

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Solution

The correct option is B $25$
Let the third proportional of $16$ and $20$ be x.
Then $16, 20, x$ are in proportion.
This means $16 : 20 = 20 : x$
So, $16 \times x = 20 \times 20$
$x = \frac{20 \times 20}{16} = 25$
Therefore, the third proportional of $16$ and $20$ is $25$ .

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