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Finding the Fourth Proportional to 321,872.10, 482,808.15 and 85,251.30

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Solution

The fourth proportional to 321,872.10, 482,808.15 and 85,251.30 is: 127,876.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,872.10 : 482,808.15 = 85,251.30 : x
  2. Step 2: Convert to fraction form
    321,872.10/482,808.15 = 85,251.30/x
  3. Step 3: Cross multiply
    321,872.10x = 482,808.15 × 85,251.30
  4. Step 4: Simplify right side
    321,872.10x = 41,160,022,438.10
  5. Step 5: Solve for x
    x = 41,160,022,438.10/321,872.10
  6. Step 6: Final answer
    x = 127,876.95

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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.