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Finding the Fourth Proportional to 81,761.40, 122,642.10 and 67,937.40

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Solution

The fourth proportional to 81,761.40, 122,642.10 and 67,937.40 is: 101,906.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,761.40 : 122,642.10 = 67,937.40 : x
  2. Step 2: Convert to fraction form
    81,761.40/122,642.10 = 67,937.40/x
  3. Step 3: Cross multiply
    81,761.40x = 122,642.10 × 67,937.40
  4. Step 4: Simplify right side
    81,761.40x = 8,331,985,404.54
  5. Step 5: Solve for x
    x = 8,331,985,404.54/81,761.40
  6. Step 6: Final answer
    x = 101,906.10

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1.5x scale

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.