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Finding the Fourth Proportional to 80,600.60, 120,900.90 and 77,187.80

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Solution

The fourth proportional to 80,600.60, 120,900.90 and 77,187.80 is: 115,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,600.60 : 120,900.90 = 77,187.80 : x
  2. Step 2: Convert to fraction form
    80,600.60/120,900.90 = 77,187.80/x
  3. Step 3: Cross multiply
    80,600.60x = 120,900.90 × 77,187.80
  4. Step 4: Simplify right side
    80,600.60x = 9,332,074,489.02
  5. Step 5: Solve for x
    x = 9,332,074,489.02/80,600.60
  6. Step 6: Final answer
    x = 115,781.70

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1.5x scale

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.