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# Proportions

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### Proportions

1. 1. Ratios and Proportions
2. 2. Definitions <ul><li>A proportion is two ratios that are equivalent </li></ul><ul><li>A ratio is a comparison of two items </li></ul><ul><li>Equivalent means equal </li></ul>
3. 3. How do you write equivalent ratios?
4. 4. To check if 2 ratios are proportional…you can use cross products or cross multiplying = Is 2 x 10 equal to 4 x 5? If yes, you have a proportion!
5. 5. You try it! Is this a proportion? =
6. 6. You can also use “scale factor” to see if two ratios form a proportion = x 3 = x 3 = Since 3 x 3 = 9 and 8 x 3 = 24, these ratios do form a proportion! 3 is called the “scale factor”.
7. 7. You Try it! Is this a proportion? =
8. 8. You Try it! Is this a proportion? =