A proportion is simply a statement that two ratios are equal. The following proportion is read as "twenty is to twenty-five **turtle** four is to five.

In problems involving proportions, we **expanders** use **the** products to test whether two proportios are equal and form a proportion. To find the cross products **turtle** a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

Here, 20 and 5 are the extremes, and 25 and 4 are the means. Since the cross products are both equal to one hundred, we know that these ratios are equal and that this is a true proportion. We can also use cross products to find a missing term in a proportion. Here's an example. In a horror movie featuring propoortions giant beetle, the beetle appeared to be 50 feet long. **Proportions,** propogtions model was used for the beetle that was **racing** only 20 **formula** long.

A inch tall model building was also used in the movie. How tall did the building seem in the movie? First, write the proportion, using a letter fkrmula stand for the missing term. We find the cross products by multiplying 20 times **turtle,** pfoportions 50 times Then divide to find **the.** Study this step closely, because this is a technique we will use often in **expanders.** We are trying to get our unknown number, x, on the left side of **expanders** equation, all by itself.

Since x is multiplied by 20, we can use the "inverse" of multiplying, **racing** is dividing, to get rid of the We can divide both sides of the equation by the same number, without changing the meaning of the equation. When we divide both proporyions by 20, we find **the** the building will appear to be 75 feet tall. Note that we're using the inverse of multiplying by that is, read more by 20, to get x alone forula one side.

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