If $a : b = c : d$ , then the correct relationship is

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

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

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\frac{a}{b} = \frac{b}{a}

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

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Solution

The correct option is D $\frac{d}{b} = \frac{c}{a}$
Given : $a : b = c : d$
$⟹$ $\frac{a}{b} = \frac{c}{d}$
$⟹$ $a \times d = b \times c$
$⟹$ $\frac{d}{b} = \frac{c}{a}$
Hence, option D is correct.

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