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Finding the Fourth Proportional to 485,379,640.80, 728,069,461.20 and 178,891,711.20

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Solution

The fourth proportional to 485,379,640.80, 728,069,461.20 and 178,891,711.20 is: 268,337,566.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,379,640.80 : 728,069,461.20 = 178,891,711.20 : x
  2. Step 2: Convert to fraction form
    485,379,640.80/728,069,461.20 = 178,891,711.20/x
  3. Step 3: Cross multiply
    485,379,640.80x = 728,069,461.20 × 178,891,711.20
  4. Step 4: Simplify right side
    485,379,640.80x = 130,245,591,786,530,000
  5. Step 5: Solve for x
    x = 130,245,591,786,530,000/485,379,640.80
  6. Step 6: Final answer
    x = 268,337,566.80

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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.