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Finding the Fourth Proportional to 392.28, 587.22 and 255.04

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Solution

The fourth proportional to 392.28, 587.22 and 255.04 is: 381.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.28 : 587.22 = 255.04 : x
  2. Step 2: Convert to fraction form
    392.28/587.22 = 255.04/x
  3. Step 3: Cross multiply
    392.28x = 587.22 × 255.04
  4. Step 4: Simplify right side
    392.28x = 149,764.59
  5. Step 5: Solve for x
    x = 149,764.59/392.28
  6. Step 6: Final answer
    x = 381.78

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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.