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Finding the Fourth Proportional to 80,861.70, 121,292.55 and 68,031.30

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Solution

The fourth proportional to 80,861.70, 121,292.55 and 68,031.30 is: 102,046.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,861.70 : 121,292.55 = 68,031.30 : x
  2. Step 2: Convert to fraction form
    80,861.70/121,292.55 = 68,031.30/x
  3. Step 3: Cross multiply
    80,861.70x = 121,292.55 × 68,031.30
  4. Step 4: Simplify right side
    80,861.70x = 8,251,689,856.82
  5. Step 5: Solve for x
    x = 8,251,689,856.82/80,861.70
  6. Step 6: Final answer
    x = 102,046.95

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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.