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Find the value of x if 16 : 24 :: x : 30.

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Find the value of x if 16 : 24 :: x : 30.

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Given the two ratios are in proportion.

Product of extremes = 16 × 30 = 480

Product of means = 24 × x

We know that product of extremes = product of mean 480

480 = 24 × x

⇒ x = 20

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