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Finding the Fourth Proportional to 396.20, 546.32 and 248.66

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Solution

The fourth proportional to 396.20, 546.32 and 248.66 is: 342.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.20 : 546.32 = 248.66 : x
  2. Step 2: Convert to fraction form
    396.20/546.32 = 248.66/x
  3. Step 3: Cross multiply
    396.20x = 546.32 × 248.66
  4. Step 4: Simplify right side
    396.20x = 135,847.93
  5. Step 5: Solve for x
    x = 135,847.93/396.20
  6. Step 6: Final answer
    x = 342.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.