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Finding the Fourth Proportional to 83,890.80, 126,127.80 and 71,060.40

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Solution

The fourth proportional to 83,890.80, 126,127.80 and 71,060.40 is: 106,837.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,890.80 : 126,127.80 = 71,060.40 : x
  2. Step 2: Convert to fraction form
    83,890.80/126,127.80 = 71,060.40/x
  3. Step 3: Cross multiply
    83,890.80x = 126,127.80 × 71,060.40
  4. Step 4: Simplify right side
    83,890.80x = 8,962,691,919.12
  5. Step 5: Solve for x
    x = 8,962,691,919.12/83,890.80
  6. Step 6: Final answer
    x = 106,837.60

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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.