A cylinder fish tank has a volume of 301.44, a rectangular fish tank as a volume of 300, and a triangular prism tank has a volume of 253.75. Obviously the cylinder tank holds more water, but is there a mathematical reason why other than its bigger?

I think you are leaving something out. I assume they all have the same height.

The area of a polygon increases with the number of sides, if the perimeter is constant.

A square has more area than a triangle, and has the most area of any rectangle. A circle has the maximum area for a given perimeter.

The triangular prism has a height of 17.5 in and a base area of 14.5 in. The rectangular prism has dimensions of 10 x 5 x 6, and the cylinder has a height of 6 in and a dimater of 8 in.

given the various dimensions, I'd say it holds more water because it is bigger.

Of course, that is always true :-) ...

Yes, there is a mathematical reason why the cylinder tank holds more water compared to the rectangular and triangular prism tanks, even if they have similar volumes. The shape of the tank affects its capacity to hold water.

To understand this, let's break it down into individual geometric shapes.

1. Cylinder: The formula to calculate the volume of a cylinder is V = πr²h, where V is the volume, r is the radius of the base, and h is the height (or depth) of the cylinder. In this case, the volume of the cylinder is given as 301.44. Since the cylinder is not perfectly symmetrical, we cannot directly solve for the radius and height from this information alone.

2. Rectangular Prism: The formula to calculate the volume of a rectangular prism is V = lwh, where V is the volume, l represents the length, w represents the width, and h represents the height (or depth) of the prism. In this case, the volume of the rectangular fish tank is given as 300. Unfortunately, the dimensions (length, width, height) of the rectangular tank are not provided, so we cannot determine its specific shape.

3. Triangular Prism: The formula to calculate the volume of a triangular prism is V = (1/2)ah, where V is the volume, a represents the base (triangle's base length multiplied by its height), and h represents the height (or depth) of the prism. In this case, the volume of the triangular prism tank is given as 253.75. Unfortunately, the specific dimensions (base length and height) of the triangular tank are not provided, so we cannot determine its specific shape.

Without knowing the specific dimensions of the rectangular and triangular prism tanks, we cannot compare their shapes directly. However, if we assume that the tanks have similar shapes and proportions (e.g., same base area and height), then we can compare their volumes using the given values.

Comparing the volumes you provided, 301.44 (cylinder), 300 (rectangle), and 253.75 (triangular prism), we can deduce that the cylinder tank does indeed hold more water than the rectangular and triangular prism tanks, even though the volumes are close.