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Finding the Fourth Proportional to 139,478.46, 209,115.17 and 44,653.78

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Solution

The fourth proportional to 139,478.46, 209,115.17 and 44,653.78 is: 66,947.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,478.46 : 209,115.17 = 44,653.78 : x
  2. Step 2: Convert to fraction form
    139,478.46/209,115.17 = 44,653.78/x
  3. Step 3: Cross multiply
    139,478.46x = 209,115.17 × 44,653.78
  4. Step 4: Simplify right side
    139,478.46x = 9,337,783,001.42
  5. Step 5: Solve for x
    x = 9,337,783,001.42/139,478.46
  6. Step 6: Final answer
    x = 66,947.85

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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.