If this is a round pool that is 27 feet across by 52 inches tall and you fill it with 4 feet (48 inches) of water, the total volume would be 17,204 gallons of water.
If you filled it all the way to the top it would be holding about 15,594 gallons of water. If you filled it to three feet deep, it decreases to around 10,200 gallons.
956 gallons.
If that is 4 feet tall and 18 inches in diameter, it would be 16.83 gallons.
About 16.
4400 gallons, or 4,398.24 gallon rounded off.
402124.8 gallons of water
If you filled it all the way to the top (40") it would hold about 2,830 gallons of water.
If you filled it all the way to the top it would be holding about 15,594 gallons of water. If you filled it to three feet deep, it decreases to around 10,200 gallons.
956 gallons.
This tank can hold up to 134.65 gallons of water.
If that is 4 feet tall and 18 inches in diameter, it would be 16.83 gallons.
11220.78
About 16.
A cylindrical tank 9 ft in diameter and 100 ft tall will hold ~190,418 gallons.
Assuming that the pool diamater diminishes 1 foot for each foot of height, and the pool is filled to the top, the total capacity would be about 6439 gallons.
4400 gallons, or 4,398.24 gallon rounded off.
Assuming it is a rectangle, 8.485 US gallons