The formula for the volume of a right rectangular prism is V = lwh, where l is the length, w is the width, and h is the height.
Given that the base is 15 inches squared and the height is 5 inches, we can plug in these values into the formula:
V = 15 * w * 5
V = 75w
Since we are not given the width of the prism, we cannot calculate the exact volume. The volume will be 75 times the width of the prism in cubic inches.