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Finding the Fourth Proportional to 139,872.42, 208,793.70 and 129,464.73

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Solution

The fourth proportional to 139,872.42, 208,793.70 and 129,464.73 is: 193,257.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,872.42 : 208,793.70 = 129,464.73 : x
  2. Step 2: Convert to fraction form
    139,872.42/208,793.70 = 129,464.73/x
  3. Step 3: Cross multiply
    139,872.42x = 208,793.70 × 129,464.73
  4. Step 4: Simplify right side
    139,872.42x = 27,031,419,996.20
  5. Step 5: Solve for x
    x = 27,031,419,996.20/139,872.42
  6. Step 6: Final answer
    x = 193,257.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.