If x : 2 :: y : 4 are in proportion, then which of the following equations is true?

x = 8 y

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2 x = y

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x = 4 y

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x = 2 y

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Solution

The correct option is B $2 x = y$
If two ratios are in proportion, they are equal.

$∴$ $\frac{x}{2} = \frac{y}{4}$

$\Rightarrow$ $4 x = 2 y$
$\Rightarrow$ $2 x = y$

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