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Finding the Third Proportional to 721.13 and 801.56

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Solution

The third proportional to 721.13 and 801.56 is: 890.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 801.56 = 801.56 : x
  2. Step 2: Convert to fraction form
    721.13/801.56 = 801.56/x
  3. Step 3: Cross multiply
    721.13x = 801.56 × 801.56
  4. Step 4: Simplify right side
    721.13x = 642,502.44
  5. Step 5: Solve for x
    x = 642,502.44/721.13
  6. Step 6: Final answer
    x = 890.97

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.