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Finding the Fourth Proportional to 139,451.49, 208,947.33 and 80,336.88

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Solution

The fourth proportional to 139,451.49, 208,947.33 and 80,336.88 is: 120,372.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,451.49 : 208,947.33 = 80,336.88 : x
  2. Step 2: Convert to fraction form
    139,451.49/208,947.33 = 80,336.88/x
  3. Step 3: Cross multiply
    139,451.49x = 208,947.33 × 80,336.88
  4. Step 4: Simplify right side
    139,451.49x = 16,786,176,576.53
  5. Step 5: Solve for x
    x = 16,786,176,576.53/139,451.49
  6. Step 6: Final answer
    x = 120,372.87

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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.