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If two ratios are equivalent then their cross-product must be 1, and their unit rates must be the same.
Rates are ratios ... Speed is a rate of distance per unit of time... ratio of distance to time. Proportions are two equal ratios, whether they are rates or not.
The answer depends on what information is available and which bits are missing. Without that information it is not possible to give a particularly useful answer.
unit rate is always over 1 it is the dominator is always one
Unit rates are a special type of rates: those where the numerator or, more usually the denominator, of the rate is 1.