Home / 80,911.20-121,512.60-78,286.80

Finding the Fourth Proportional to 80,911.20, 121,512.60 and 78,286.80

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Solution

The fourth proportional to 80,911.20, 121,512.60 and 78,286.80 is: 117,571.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,911.20 : 121,512.60 = 78,286.80 : x
  2. Step 2: Convert to fraction form
    80,911.20/121,512.60 = 78,286.80/x
  3. Step 3: Cross multiply
    80,911.20x = 121,512.60 × 78,286.80
  4. Step 4: Simplify right side
    80,911.20x = 9,512,832,613.68
  5. Step 5: Solve for x
    x = 9,512,832,613.68/80,911.20
  6. Step 6: Final answer
    x = 117,571.27

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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.