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Finding the Fourth Proportional to 139,330.80, 208,909.80 and 80,137.20

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Solution

The fourth proportional to 139,330.80, 208,909.80 and 80,137.20 is: 120,156.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,330.80 : 208,909.80 = 80,137.20 : x
  2. Step 2: Convert to fraction form
    139,330.80/208,909.80 = 80,137.20/x
  3. Step 3: Cross multiply
    139,330.80x = 208,909.80 × 80,137.20
  4. Step 4: Simplify right side
    139,330.80x = 16,741,446,424.56
  5. Step 5: Solve for x
    x = 16,741,446,424.56/139,330.80
  6. Step 6: Final answer
    x = 120,156.11

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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.