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Finding the Fourth Proportional to 392.55, 587.91 and 378.88

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Solution

The fourth proportional to 392.55, 587.91 and 378.88 is: 567.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.55 : 587.91 = 378.88 : x
  2. Step 2: Convert to fraction form
    392.55/587.91 = 378.88/x
  3. Step 3: Cross multiply
    392.55x = 587.91 × 378.88
  4. Step 4: Simplify right side
    392.55x = 222,745.16
  5. Step 5: Solve for x
    x = 222,745.16/392.55
  6. Step 6: Final answer
    x = 567.44

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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.