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Finding the Fourth Proportional to 81,279.68, 121,934.68 and 36,909.52

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Solution

The fourth proportional to 81,279.68, 121,934.68 and 36,909.52 is: 55,371.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.68 : 121,934.68 = 36,909.52 : x
  2. Step 2: Convert to fraction form
    81,279.68/121,934.68 = 36,909.52/x
  3. Step 3: Cross multiply
    81,279.68x = 121,934.68 × 36,909.52
  4. Step 4: Simplify right side
    81,279.68x = 4,500,550,510.15
  5. Step 5: Solve for x
    x = 4,500,550,510.15/81,279.68
  6. Step 6: Final answer
    x = 55,371.16

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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.