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Finding the Fourth Proportional to 418.41, 627.12 and 255.72

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Solution

The fourth proportional to 418.41, 627.12 and 255.72 is: 383.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.41 : 627.12 = 255.72 : x
  2. Step 2: Convert to fraction form
    418.41/627.12 = 255.72/x
  3. Step 3: Cross multiply
    418.41x = 627.12 × 255.72
  4. Step 4: Simplify right side
    418.41x = 160,367.13
  5. Step 5: Solve for x
    x = 160,367.13/418.41
  6. Step 6: Final answer
    x = 383.28

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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.