Solving Proportions | MathHelp.com - By MathHelp.com
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| 00:0-1 | To solve this proportion for D , we can use | |
| 00:03 | cross products nine times D . Yeah , And 15 | |
| 00:12 | times six . Yeah . Remember that the cross products | |
| 00:19 | of a proportion must be equal . So we know | |
| 00:22 | that nine times D equals 15 times six , nine | |
| 00:27 | times d is nine d , And 15 times six | |
| 00:32 | is 90 . So we have 90 equals 90 . | |
| 00:36 | Now . To solve for D . Since D is | |
| 00:39 | being multiplied by nine , we need to divide by | |
| 00:42 | nine on both sides of the equation to get D | |
| 00:46 | equals 10 . |
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