Solving Proportions Using Cross Products
Solving Proportions Using Cross Products
Solving Proportions Using Cross Products
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Example 2<br />
Writing and <strong>Solving</strong> a Proportion<br />
Earnings You earn $68 mowing 4 lawns. How much would you<br />
earn if you mowed 7 lawns?<br />
Solution<br />
6 8 <br />
4<br />
<br />
x 7 <br />
Money earned<br />
Lawns mowed<br />
68<br />
p 7 4 p x <strong>Cross</strong> products property<br />
476<br />
<br />
4x<br />
Multiply.<br />
476<br />
<br />
4<br />
4 x <br />
Divide each side by 4 .<br />
4<br />
119<br />
x<br />
Simplify.<br />
Answer: If you mowed 7 lawns, you would earn $119 .<br />
Checkpoint<br />
Tell whether the ratios form a proportion.<br />
9<br />
1. 1 5<br />
2. 1 2 6<br />
<br />
3 9 65<br />
45<br />
2 8<br />
yes<br />
no<br />
Use the cross products property to solve the proportion.<br />
3. 1 4 x 4<br />
4. <br />
42<br />
6 9 1 6<br />
<br />
x<br />
2 36<br />
108 Chapter 6 Notetaking Guide
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