The fourth proportion to 5, 8, 15 is-

Solution (By Examveda Team)

Let the fourth proportional to 5, 8, 15 be x.
Then,
$$\eqalign{ & \Rightarrow 5:8:15:x \cr & \Rightarrow 5x = 8 \times 15 \cr & \Rightarrow x = \frac{{8 \times 15}}{5} = 24. \cr} $$