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Finding the Third Proportional to 20,781.25 and 31,390.13

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Solution

The third proportional to 20,781.25 and 31,390.13 is: 47,414.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.25 : 31,390.13 = 31,390.13 : x
  2. Step 2: Convert to fraction form
    20,781.25/31,390.13 = 31,390.13/x
  3. Step 3: Cross multiply
    20,781.25x = 31,390.13 × 31,390.13
  4. Step 4: Simplify right side
    20,781.25x = 985,339,947.52
  5. Step 5: Solve for x
    x = 985,339,947.52/20,781.25
  6. Step 6: Final answer
    x = 47,414.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.