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Finding the Fourth Proportional to 321,940.10, 482,910.15 and 85,306.70

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Solution

The fourth proportional to 321,940.10, 482,910.15 and 85,306.70 is: 127,960.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,940.10 : 482,910.15 = 85,306.70 : x
  2. Step 2: Convert to fraction form
    321,940.10/482,910.15 = 85,306.70/x
  3. Step 3: Cross multiply
    321,940.10x = 482,910.15 × 85,306.70
  4. Step 4: Simplify right side
    321,940.10x = 41,195,471,293.01
  5. Step 5: Solve for x
    x = 41,195,471,293.01/321,940.10
  6. Step 6: Final answer
    x = 127,960.05

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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.