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Finding the Fourth Proportional to 67,221.76, 100,721.70 and 39,062.77

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Solution

The fourth proportional to 67,221.76, 100,721.70 and 39,062.77 is: 58,529.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,221.76 : 100,721.70 = 39,062.77 : x
  2. Step 2: Convert to fraction form
    67,221.76/100,721.70 = 39,062.77/x
  3. Step 3: Cross multiply
    67,221.76x = 100,721.70 × 39,062.77
  4. Step 4: Simplify right side
    67,221.76x = 3,934,468,601.11
  5. Step 5: Solve for x
    x = 3,934,468,601.11/67,221.76
  6. Step 6: Final answer
    x = 58,529.69

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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.