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Finding the Third Proportional to 15,540 and 20,438

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Solution

The third proportional to 15,540 and 20,438 is: 26,879.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,540 : 20,438 = 20,438 : x
  2. Step 2: Convert to fraction form
    15,540/20,438 = 20,438/x
  3. Step 3: Cross multiply
    15,540x = 20,438 × 20,438
  4. Step 4: Simplify right side
    15,540x = 417,711,844
  5. Step 5: Solve for x
    x = 417,711,844/15,540
  6. Step 6: Final answer
    x = 26,879.78

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.