Finding the Third Proportional to 641 and 665
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Solution
The third proportional to 641 and 665 is: 689.90
Step by Step Solution
- Step 1: Write the proportion equation
641 : 665 = 665 : x - Step 2: Convert to fraction form
641/665 = 665/x - Step 3: Cross multiply
641x = 665 × 665 - Step 4: Simplify right side
641x = 442,225 - Step 5: Solve for x
x = 442,225/641 - Step 6: Final answer
x = 689.90
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These problems maintain the same ratio (1.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.