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Finding the Fourth Proportional to 408.38, 612.74 and 254.43

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Solution

The fourth proportional to 408.38, 612.74 and 254.43 is: 381.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 612.74 = 254.43 : x
  2. Step 2: Convert to fraction form
    408.38/612.74 = 254.43/x
  3. Step 3: Cross multiply
    408.38x = 612.74 × 254.43
  4. Step 4: Simplify right side
    408.38x = 155,898.17
  5. Step 5: Solve for x
    x = 155,898.17/408.38
  6. Step 6: Final answer
    x = 381.75

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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.