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Finding the Fourth Proportional to 139,512.80, 209,269.20 and 133,607.90

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Solution

The fourth proportional to 139,512.80, 209,269.20 and 133,607.90 is: 200,411.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,512.80 : 209,269.20 = 133,607.90 : x
  2. Step 2: Convert to fraction form
    139,512.80/209,269.20 = 133,607.90/x
  3. Step 3: Cross multiply
    139,512.80x = 209,269.20 × 133,607.90
  4. Step 4: Simplify right side
    139,512.80x = 27,960,018,346.68
  5. Step 5: Solve for x
    x = 27,960,018,346.68/139,512.80
  6. Step 6: Final answer
    x = 200,411.85

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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.