Using proportions to find the value given a certain percentage, 120% of what is 90?

The video tutorial explains how to solve a percentage problem where 120% of an unknown value equals 90. It begins by discussing the concept of percentages as a part over a whole, then sets up the equation to find the unknown value. The solution involves using cross multiplication and verifying the result by converting percentages to decimals. The tutorial concludes by emphasizing the importance of creating proportions in percentage problems.

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