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Finding the Fourth Proportional to 80,543,999.90, 120,815,999.85 and 80,543,999.90

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Solution

The fourth proportional to 80,543,999.90, 120,815,999.85 and 80,543,999.90 is: 120,815,999.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,543,999.90 : 120,815,999.85 = 80,543,999.90 : x
  2. Step 2: Convert to fraction form
    80,543,999.90/120,815,999.85 = 80,543,999.90/x
  3. Step 3: Cross multiply
    80,543,999.90x = 120,815,999.85 × 80,543,999.90
  4. Step 4: Simplify right side
    80,543,999.90x = 9,731,003,879,836,800
  5. Step 5: Solve for x
    x = 9,731,003,879,836,800/80,543,999.90
  6. Step 6: Final answer
    x = 120,815,999.85

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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.