How can you use rates to determine whether a situation is a proportional relationship

If the rate is constant, then the situation is a proportional relationship.

Step-by-step explanation:

A magnitude is what can be measured.

Proportionality is a constant relationship or relationship between different magnitudes.

The relationship between the magnitudes is direct when the magnitude increases, so does the other (or when one magnitude decreases, so does the other).   In other words, two magnitudes a and b are directly proportional if, by multiplying or dividing one of them by a number, the other is multiplied or divided by that number.

On the other hand, two magnitudes are inversely proportional if, when one increases, the other decreases in the same proportion.

Everything mentioned above then indicates that the proportion or rate must be constant for proportionality to be maintained, whether direct or inverse. So you can say that if the rate is constant, then the situation is a proportional relationship.

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