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The fourth proportional to 5, 8, 15 is:

18
24
19
20
Explanation:

Let the fourth proportional to 5, 8, 15 be x.

Then, 5 : 8 : 15 : x

=> 5x = (8 x 15)

x = $\dfrac{(8 \times15)}{5} = 24$
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