HELP ME SOLVE THIS... BRAINLIEST AND 25 POINTS WILL BE GIVEN

All per-unit concepts rely on ratios, meaning, to provide a type of measurement

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

For each proportion find the unknown number x 1/5/8=×/15