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Finding the Fourth Proportional to 99,691,843.60, 149,691,730.20 and 54,342,211.60

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Solution

The fourth proportional to 99,691,843.60, 149,691,730.20 and 54,342,211.60 is: 81,597,243.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,691,843.60 : 149,691,730.20 = 54,342,211.60 : x
  2. Step 2: Convert to fraction form
    99,691,843.60/149,691,730.20 = 54,342,211.60/x
  3. Step 3: Cross multiply
    99,691,843.60x = 149,691,730.20 × 54,342,211.60
  4. Step 4: Simplify right side
    99,691,843.60x = 8,134,579,677,298,510
  5. Step 5: Solve for x
    x = 8,134,579,677,298,510/99,691,843.60
  6. Step 6: Final answer
    x = 81,597,243.90

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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.