It may be called the conversion factor.
Note, however, that this only works when both measurements are absolute measurements, or equivalently, the measurement is on a ratio scale. For example, a fraction representing equivalent Fahrenheit and Celsius temperatures is not a conversion factor because the two Zero values do not correspond to the same temperature.
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conversion factor
A rate is a fraction that compares two quantities measured in different units. If the denominator of the fraction is 1 unit, the rate is called a unit rate.
It is called "writing a fraction as an equivalent fraction with a larger denominator"!
It is called an equivalent fraction.
0.87 is called a decimal fraction. The equivalent (ordinary) fraction is 87/100.