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Finding the Fourth Proportional to 138,879.40, 208,319.10 and 118,834.60

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Solution

The fourth proportional to 138,879.40, 208,319.10 and 118,834.60 is: 178,251.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,879.40 : 208,319.10 = 118,834.60 : x
  2. Step 2: Convert to fraction form
    138,879.40/208,319.10 = 118,834.60/x
  3. Step 3: Cross multiply
    138,879.40x = 208,319.10 × 118,834.60
  4. Step 4: Simplify right side
    138,879.40x = 24,755,516,920.86
  5. Step 5: Solve for x
    x = 24,755,516,920.86/138,879.40
  6. Step 6: Final answer
    x = 178,251.90

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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.