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The volume of a rectangular prism is calculated by multiplying its length, width, and height together. This formula is based on the fact that volume measures the amount of three-dimensional space an object occupies.

In the case of a rectangular prism, each dimension contributes to the overall space: the length provides one dimension, the width gives the other horizontal dimension, and the height accounts for the vertical dimension. By multiplying these three dimensions together, you obtain the total volume, which expresses how much space the prism takes up.

Other formulas mentioned do not correctly represent the calculation of volume, as they use addition or incorrect operations that do not correlate with the concept of three-dimensional space measurement. Thus, the multiplication of length, width, and height is the standard and accurate way to find the volume of a rectangular prism.