Home / 87,729.60-131,210.40-78,436.80

Finding the Fourth Proportional to 87,729.60, 131,210.40 and 78,436.80

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Solution

The fourth proportional to 87,729.60, 131,210.40 and 78,436.80 is: 117,311.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,729.60 : 131,210.40 = 78,436.80 : x
  2. Step 2: Convert to fraction form
    87,729.60/131,210.40 = 78,436.80/x
  3. Step 3: Cross multiply
    87,729.60x = 131,210.40 × 78,436.80
  4. Step 4: Simplify right side
    87,729.60x = 10,291,723,902.72
  5. Step 5: Solve for x
    x = 10,291,723,902.72/87,729.60
  6. Step 6: Final answer
    x = 117,311.88

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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.