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Finding the Fourth Proportional to 80,999.70, 121,499.55 and 77,937.90

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Solution

The fourth proportional to 80,999.70, 121,499.55 and 77,937.90 is: 116,906.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.70 : 121,499.55 = 77,937.90 : x
  2. Step 2: Convert to fraction form
    80,999.70/121,499.55 = 77,937.90/x
  3. Step 3: Cross multiply
    80,999.70x = 121,499.55 × 77,937.90
  4. Step 4: Simplify right side
    80,999.70x = 9,469,419,777.95
  5. Step 5: Solve for x
    x = 9,469,419,777.95/80,999.70
  6. Step 6: Final answer
    x = 116,906.85

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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.