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Finding the Fourth Proportional to 814.62, 1,222.17 and 398.18

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Solution

The fourth proportional to 814.62, 1,222.17 and 398.18 is: 597.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.62 : 1,222.17 = 398.18 : x
  2. Step 2: Convert to fraction form
    814.62/1,222.17 = 398.18/x
  3. Step 3: Cross multiply
    814.62x = 1,222.17 × 398.18
  4. Step 4: Simplify right side
    814.62x = 486,635.55
  5. Step 5: Solve for x
    x = 486,635.55/814.62
  6. Step 6: Final answer
    x = 597.38

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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.