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Finding the Third Proportional to 681 and 769

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Solution

The third proportional to 681 and 769 is: 868.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 769 = 769 : x
  2. Step 2: Convert to fraction form
    681/769 = 769/x
  3. Step 3: Cross multiply
    681x = 769 × 769
  4. Step 4: Simplify right side
    681x = 591,361
  5. Step 5: Solve for x
    x = 591,361/681
  6. Step 6: Final answer
    x = 868.37

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.