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 C
$x w = y z$

Since $x, y, z$ and $w$ are in proportion so the product of extremes $=$ product of means
$x w = y z$

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