There is no special name. Maintaining the proportion would be a description but it is not used as a name.
Dividing 4 and 5 by 2 gives 2 and 2.5 : so what?
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Squaring for multiplying, and if you are dividing by the same number, you get 1
Because multiplying or dividing them by the same NON-ZERO number does not alter their ratio.
it is the same as multiplying by 0.4
Dividing by twelve is the same thing as multiplying by 1/12. Thus, multiplying a number by 12/1, or twelve, is the opposite (inverse) of dividing a number by twelve.
This is related to the fact that dividing by a number is the same as multiplying with the number's reciprocal.