A cubic foot of water is about 7.48 gallons. How many gallons of water would be needed to fill the rectangular pool to 91% capacity?

To find the volume of the pool, we multiply the dimensions:

5 feet x 28 feet x 8 feet = 1120 cubic feet

To find 91% of the pool's capacity, we multiply the volume by 0.91:

1120 cubic feet x 0.91 = 1019.2 cubic feet

Since there are 7.48 gallons in a cubic foot of water, we multiply the volume in cubic feet by 7.48 to get the volume in gallons:

1019.2 cubic feet x 7.48 gallons = 7615.3 gallons

Therefore, the pool will require approximately 7615.3 gallons of water to fill to 91% capacity.