Find the fourth proportion: 5, 75 and 3.

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Solution

The correct option is B
45

Let the fourth proportion be x.

Then, $\frac{5}{75} = \frac{3}{x}$

$⟹ 5 x = 3 \times 75$

$⟹ x = \frac{3 \times 75}{5}$

$⟹ x = 45$

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