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Finding the Fourth Proportional to 83,919.20, 126,024.60 and 81,294.80

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Solution

The fourth proportional to 83,919.20, 126,024.60 and 81,294.80 is: 122,083.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,919.20 : 126,024.60 = 81,294.80 : x
  2. Step 2: Convert to fraction form
    83,919.20/126,024.60 = 81,294.80/x
  3. Step 3: Cross multiply
    83,919.20x = 126,024.60 × 81,294.80
  4. Step 4: Simplify right side
    83,919.20x = 10,245,144,652.08
  5. Step 5: Solve for x
    x = 10,245,144,652.08/83,919.20
  6. Step 6: Final answer
    x = 122,083.44

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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.