If $a, b, c, d$ are in proportion,then

$a b = c d$

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$a d = b c$

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$a c = b d$

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$\frac{a}{b} = \frac{d}{c}$

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Solution

The correct option is B
$a d = b c$

Four numbers $a, b, c, d$ are said to be in proportion if $a : b$ and $c : d$ are equivalent ratios.
So, $\frac{a}{b} = \frac{c}{d}$ .
Cross-multiplying the values, we get
$a d = b c$
Hence, option (B) is correct answer.

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