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Finding the Fourth Proportional to 83,920.20, 126,026.10 and 81,295.80

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Solution

The fourth proportional to 83,920.20, 126,026.10 and 81,295.80 is: 122,084.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,920.20 : 126,026.10 = 81,295.80 : x
  2. Step 2: Convert to fraction form
    83,920.20/126,026.10 = 81,295.80/x
  3. Step 3: Cross multiply
    83,920.20x = 126,026.10 × 81,295.80
  4. Step 4: Simplify right side
    83,920.20x = 10,245,392,620.38
  5. Step 5: Solve for x
    x = 10,245,392,620.38/83,920.20
  6. Step 6: Final answer
    x = 122,084.94

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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.