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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.
A proportion is a relationship between two equal ratios or fractions. It compares corresponding parts of a whole and indicates how they relate to each other. Proportions are often used in math and statistics to solve problems involving ratios, percentages, and percentages.
You can't.You don't solve math problems in boxing.You just choose where to punch him.
It was invented to systematically solve complicated logic/math problems.
In order to solve problems using Calculus, you have to know Calculus.