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Proportions are solved by using this cross-product rule. Practice: For each word problem, write and then solve the proportion to find the answer. A. Write each ratio as a fraction in lowest terms. 1. 2 to 4 6. 3 to 12 11. 35:7 2. 15 7. 7: 4 12. 8 20 28 8. 18 3. 6:18 12 13.
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