The volume of a sphere is given by the formula V = (4/3)πr^3, where r is the radius of the sphere.
Substituting the given value of r = 1.5 feet, we get:
V = (4/3)π(1.5)^3
V ≈ 14.1 cubic feet (rounded to the nearest tenth)
Therefore, the volume of the spherical fountain is approximately 14.1 cubic feet.