Dr. Pepper-
Welcome back!
I hope the mishpacha is doing well.
The riddle thread missed you.
On to the task at hand…
The denominator of the fractional equivelent of the missing percentage is how many times the original number will be just short of.
In other words, if it bounces 50%, and 1/2 is the missing portion of 100% the total would be just shy of 2 * the original height.
Since it bounced 75%, and 1/4 is the missing portion of 100% the total would be just shy of 4 * the original height.
The answer is: just shy of 24 feet.