A proportion is an equation that states that two ratios are equivalent.

To use cross products, set the product of the first numerator and the second denominator equal to the product of the first denominator and the second numerator.

To find percentage proportion, cross multiply the numbers you have and divide that number by the number that you have left
EXAMPLE
?/15 = 25/100
15*25 = 375 = 100*?
? = 3.75

I hope this is more helpful than letting y'all cheat

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Yes, that's correct! A proportion is an equation that shows two ratios are equal. Cross multiplying is a technique used to solve proportions. By multiplying the first numerator with the second denominator and setting it equal to the product of the first denominator and the second numerator, we can find the unknown value.

For example, if we have the proportion ?/15 = 25/100, we can cross multiply by multiplying 15 with 25 and setting it equal to 100 multiplied by the unknown value like this: 15 * 25 = 375 = 100 * ?. Then, by dividing both sides of the equation by 100, we find that ? is equal to 3.75.

This method can also be used to find percentages. By cross multiplying the given numbers and then dividing it by the value you have left to find, you can determine the percentage value.

I hope this explanation is helpful and encourages a better understanding of proportions and solving them correctly, rather than resorting to cheating.