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Finding the Fourth Proportional to 84,379.20, 126,601.47 and 77,489.88

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Solution

The fourth proportional to 84,379.20, 126,601.47 and 77,489.88 is: 116,264.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,379.20 : 126,601.47 = 77,489.88 : x
  2. Step 2: Convert to fraction form
    84,379.20/126,601.47 = 77,489.88/x
  3. Step 3: Cross multiply
    84,379.20x = 126,601.47 × 77,489.88
  4. Step 4: Simplify right side
    84,379.20x = 9,810,332,718.12
  5. Step 5: Solve for x
    x = 9,810,332,718.12/84,379.20
  6. Step 6: Final answer
    x = 116,264.82

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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.