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Finding the Fourth Proportional to 80,718.78, 120,972.88 and 50,311.36

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Solution

The fourth proportional to 80,718.78, 120,972.88 and 50,311.36 is: 75,401.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,718.78 : 120,972.88 = 50,311.36 : x
  2. Step 2: Convert to fraction form
    80,718.78/120,972.88 = 50,311.36/x
  3. Step 3: Cross multiply
    80,718.78x = 120,972.88 × 50,311.36
  4. Step 4: Simplify right side
    80,718.78x = 6,086,310,115.92
  5. Step 5: Solve for x
    x = 6,086,310,115.92/80,718.78
  6. Step 6: Final answer
    x = 75,401.41

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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.