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Finding the Third Proportional to 689 and 748

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Solution

The third proportional to 689 and 748 is: 812.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    689 : 748 = 748 : x
  2. Step 2: Convert to fraction form
    689/748 = 748/x
  3. Step 3: Cross multiply
    689x = 748 × 748
  4. Step 4: Simplify right side
    689x = 559,504
  5. Step 5: Solve for x
    x = 559,504/689
  6. Step 6: Final answer
    x = 812.05

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.