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There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.
the three kinds of proportions are indirect proportion, direct proportion and thepartitive proportion
100
Because you simply set it up in a proportion box, for example if you have the fraction 4/8 you put the 4 on top of the 8 and 100 next to the 8 because with percents you always use 100. then solve,
It really depends on the specific problem; but quite often, there are several ways to solve such problems.