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Finding the Fourth Proportional to 80,856.80, 121,285.20 and 71,015.30

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Solution

The fourth proportional to 80,856.80, 121,285.20 and 71,015.30 is: 106,522.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,856.80 : 121,285.20 = 71,015.30 : x
  2. Step 2: Convert to fraction form
    80,856.80/121,285.20 = 71,015.30/x
  3. Step 3: Cross multiply
    80,856.80x = 121,285.20 × 71,015.30
  4. Step 4: Simplify right side
    80,856.80x = 8,613,104,863.56
  5. Step 5: Solve for x
    x = 8,613,104,863.56/80,856.80
  6. Step 6: Final answer
    x = 106,522.95

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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.