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Finding the Fourth Proportional to 61,140.97, 84,381.56 and 40,721.90

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Solution

The fourth proportional to 61,140.97, 84,381.56 and 40,721.90 is: 56,200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,140.97 : 84,381.56 = 40,721.90 : x
  2. Step 2: Convert to fraction form
    61,140.97/84,381.56 = 40,721.90/x
  3. Step 3: Cross multiply
    61,140.97x = 84,381.56 × 40,721.90
  4. Step 4: Simplify right side
    61,140.97x = 3,436,177,760.92
  5. Step 5: Solve for x
    x = 3,436,177,760.92/61,140.97
  6. Step 6: Final answer
    x = 56,200.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.