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Finding the Fourth Proportional to 139,072.20, 208,608.30 and 75,867.90

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Solution

The fourth proportional to 139,072.20, 208,608.30 and 75,867.90 is: 113,801.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,072.20 : 208,608.30 = 75,867.90 : x
  2. Step 2: Convert to fraction form
    139,072.20/208,608.30 = 75,867.90/x
  3. Step 3: Cross multiply
    139,072.20x = 208,608.30 × 75,867.90
  4. Step 4: Simplify right side
    139,072.20x = 15,826,673,643.57
  5. Step 5: Solve for x
    x = 15,826,673,643.57/139,072.20
  6. Step 6: Final answer
    x = 113,801.85

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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.