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Finding the Fourth Proportional to 426.26, 638.19 and 220.38

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Solution

The fourth proportional to 426.26, 638.19 and 220.38 is: 329.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.26 : 638.19 = 220.38 : x
  2. Step 2: Convert to fraction form
    426.26/638.19 = 220.38/x
  3. Step 3: Cross multiply
    426.26x = 638.19 × 220.38
  4. Step 4: Simplify right side
    426.26x = 140,644.31
  5. Step 5: Solve for x
    x = 140,644.31/426.26
  6. Step 6: Final answer
    x = 329.95

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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.