Find the mean proportion of 3 and 243

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243

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Solution

The correct option is B
27

Let the mean proportion be $b$

$∴$ $3 : b :: b : 243$

$\Rightarrow$ $b \times b = 243 \times 3 = 729$

Hence $b$ = 27

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Similar questions

Find two numbers such that their mean proportional is 9 and the third proportional is 243.

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If the mean proportion of 3 and $a$ is 6. Find $a$

\frac{1}{3}

\frac{32}{3}

\frac{243}{2}

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