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 = $\dfrac{(8 \times15)}{5} = 24$
Let the fourth proportional to 5, 8, 15 be x.
Then, 5 : 8 : 15 : x
=> 5x = (8 x 15)
x = $\dfrac{(8 \times15)}{5} = 24$