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Finding the Fourth Proportional to 231,879.92, 320,002.20 and 129,909.68

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Solution

The fourth proportional to 231,879.92, 320,002.20 and 129,909.68 is: 179,279.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,879.92 : 320,002.20 = 129,909.68 : x
  2. Step 2: Convert to fraction form
    231,879.92/320,002.20 = 129,909.68/x
  3. Step 3: Cross multiply
    231,879.92x = 320,002.20 × 129,909.68
  4. Step 4: Simplify right side
    231,879.92x = 41,571,383,401.30
  5. Step 5: Solve for x
    x = 41,571,383,401.30/231,879.92
  6. Step 6: Final answer
    x = 179,279.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.