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Finding the Fourth Proportional to 426.10, 638.07 and 281.38

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Solution

The fourth proportional to 426.10, 638.07 and 281.38 is: 421.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.10 : 638.07 = 281.38 : x
  2. Step 2: Convert to fraction form
    426.10/638.07 = 281.38/x
  3. Step 3: Cross multiply
    426.10x = 638.07 × 281.38
  4. Step 4: Simplify right side
    426.10x = 179,540.14
  5. Step 5: Solve for x
    x = 179,540.14/426.10
  6. Step 6: Final answer
    x = 421.36

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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.