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Finding the Fourth Proportional to 81,751.97, 122,513.78 and 39,620.87

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Solution

The fourth proportional to 81,751.97, 122,513.78 and 39,620.87 is: 59,375.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,751.97 : 122,513.78 = 39,620.87 : x
  2. Step 2: Convert to fraction form
    81,751.97/122,513.78 = 39,620.87/x
  3. Step 3: Cross multiply
    81,751.97x = 122,513.78 × 39,620.87
  4. Step 4: Simplify right side
    81,751.97x = 4,854,101,773.27
  5. Step 5: Solve for x
    x = 4,854,101,773.27/81,751.97
  6. Step 6: Final answer
    x = 59,375.96

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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.