Question

The fourth proportional to 5, 8, 15 is ____________

___

Answer 1

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

Then, 5: 8::15: x

$\to$ 5x = 8 $\times$ 15

$\to$ x = $\frac{8\times 15}{5}$

x = 24