Let 4^th proportion be x .now, 530= 8x ∴ x = 8 ×305 x= 48 So, the fourth proportion is 48 . ...

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5 : 30 : : 8 ...

Question

$5 : 30 :: 8 : ?$

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Solution

Let $4^{t h}$ proportion be $x$ .
now, $\frac{5}{30} = \frac{8}{x}$
$∴ x = 8 \times \frac{30}{5}$
$x = 48$
So, the fourth proportion is $48$ .

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