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Finding the Fourth Proportional to 83,991,787.20, 125,987,680.80 and 30,132,100.80

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Solution

The fourth proportional to 83,991,787.20, 125,987,680.80 and 30,132,100.80 is: 45,198,151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,991,787.20 : 125,987,680.80 = 30,132,100.80 : x
  2. Step 2: Convert to fraction form
    83,991,787.20/125,987,680.80 = 30,132,100.80/x
  3. Step 3: Cross multiply
    83,991,787.20x = 125,987,680.80 × 30,132,100.80
  4. Step 4: Simplify right side
    83,991,787.20x = 3,796,273,497,423,824.50
  5. Step 5: Solve for x
    x = 3,796,273,497,423,824.50/83,991,787.20
  6. Step 6: Final answer
    x = 45,198,151.20

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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.