Question

The fourth proportional to 5, 8, 15 is:
A.18
B.24
C.19
D.20

Answer 1

24 is the answer I think

Answer 2

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Let the fourth proportional is x
Hence
5 : 8 = 15 : x
$5 \times x = 8 \times 15 \\ x = \frac{8 \times 15}{5} \\ x = 24$
So fourth proportional is 24
Option B is correct answer which is 24

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