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Finding the Fourth Proportional to 834.20, 1,251.20 and 217.95

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Solution

The fourth proportional to 834.20, 1,251.20 and 217.95 is: 326.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.20 : 1,251.20 = 217.95 : x
  2. Step 2: Convert to fraction form
    834.20/1,251.20 = 217.95/x
  3. Step 3: Cross multiply
    834.20x = 1,251.20 × 217.95
  4. Step 4: Simplify right side
    834.20x = 272,697.95
  5. Step 5: Solve for x
    x = 272,697.95/834.20
  6. Step 6: Final answer
    x = 326.90

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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.