If $x, y, z$ and $w$ are in proportion then,

x y = z w

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x z = y w

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x w = y z

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x = y = z = w

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Solution

The correct option is B $x y = z w$
Since $x, y, z$ and $w$ are in proportion,
$x : y :: z : w$
So, we can say that, $x y = z w$ ${By taking product of extreme and product of mean.}$

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