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Finding the Fourth Proportional to 422.29, 634.46 and 398.98

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Solution

The fourth proportional to 422.29, 634.46 and 398.98 is: 599.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.29 : 634.46 = 398.98 : x
  2. Step 2: Convert to fraction form
    422.29/634.46 = 398.98/x
  3. Step 3: Cross multiply
    422.29x = 634.46 × 398.98
  4. Step 4: Simplify right side
    422.29x = 253,136.85
  5. Step 5: Solve for x
    x = 253,136.85/422.29
  6. Step 6: Final answer
    x = 599.44

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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.