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,
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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.
It really depends on the specific problem; but quite often, there are several ways to solve such problems.
The rules for solving word problems are read the problem, decide what you need to do, solve the problem, and check your answer.
Please give a sample problem.