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Finding the Fourth Proportional to 72,521.29, 108,781.78 and 40,917

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Solution

The fourth proportional to 72,521.29, 108,781.78 and 40,917 is: 61,375.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,521.29 : 108,781.78 = 40,917 : x
  2. Step 2: Convert to fraction form
    72,521.29/108,781.78 = 40,917/x
  3. Step 3: Cross multiply
    72,521.29x = 108,781.78 × 40,917
  4. Step 4: Simplify right side
    72,521.29x = 4,451,024,092.26
  5. Step 5: Solve for x
    x = 4,451,024,092.26/72,521.29
  6. Step 6: Final answer
    x = 61,375.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.