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Finding the Fourth Proportional to 391.78, 587.41 and 254.92

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Solution

The fourth proportional to 391.78, 587.41 and 254.92 is: 382.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.78 : 587.41 = 254.92 : x
  2. Step 2: Convert to fraction form
    391.78/587.41 = 254.92/x
  3. Step 3: Cross multiply
    391.78x = 587.41 × 254.92
  4. Step 4: Simplify right side
    391.78x = 149,742.56
  5. Step 5: Solve for x
    x = 149,742.56/391.78
  6. Step 6: Final answer
    x = 382.21

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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.