Mathematics ACT Aspire Practice Test 2025 – Complete Study Resource

The concept of percent proportion is foundational in understanding how percentages relate to parts and wholes. The correct relationship can be articulated as "is over of equals percent over 100."

In this context, "is" refers to the part of the total you are investigating, and "of" represents the whole or total amount. The percent represents how much the part is in relation to the whole, expressed as a fraction of 100. Thus, the formula captures the idea that if you have a specific part of a whole, you can determine what percent that part is of the whole by setting it up as a ratio and comparing it to 100, which stands for the whole percentage.

The other choices do not accurately convey the percent proportion relationship. For instance, "part/whole = %*100" incorrectly suggests a different mathematical operation that does not follow the logic of proportions. The same goes for the other options that confuse the addition and ratios without establishing the proper relationship needed to interpret percentages. Hence, the expression "is/of = %/100" is the standard and correct way to set up a percent proportion.