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Finding the Fourth Proportional to 80,881.10, 121,321.65 and 72,424.70

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Solution

The fourth proportional to 80,881.10, 121,321.65 and 72,424.70 is: 108,637.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,881.10 : 121,321.65 = 72,424.70 : x
  2. Step 2: Convert to fraction form
    80,881.10/121,321.65 = 72,424.70/x
  3. Step 3: Cross multiply
    80,881.10x = 121,321.65 × 72,424.70
  4. Step 4: Simplify right side
    80,881.10x = 8,786,684,104.76
  5. Step 5: Solve for x
    x = 8,786,684,104.76/80,881.10
  6. Step 6: Final answer
    x = 108,637.05

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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.