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Finding the Fourth Proportional to 80,487.30, 120,725.55 and 21,321.70

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Solution

The fourth proportional to 80,487.30, 120,725.55 and 21,321.70 is: 31,981.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,487.30 : 120,725.55 = 21,321.70 : x
  2. Step 2: Convert to fraction form
    80,487.30/120,725.55 = 21,321.70/x
  3. Step 3: Cross multiply
    80,487.30x = 120,725.55 × 21,321.70
  4. Step 4: Simplify right side
    80,487.30x = 2,574,073,959.44
  5. Step 5: Solve for x
    x = 2,574,073,959.44/80,487.30
  6. Step 6: Final answer
    x = 31,981.12

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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.