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Finding the Fourth Proportional to 396.54, 547.26 and 221.91

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Solution

The fourth proportional to 396.54, 547.26 and 221.91 is: 306.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.54 : 547.26 = 221.91 : x
  2. Step 2: Convert to fraction form
    396.54/547.26 = 221.91/x
  3. Step 3: Cross multiply
    396.54x = 547.26 × 221.91
  4. Step 4: Simplify right side
    396.54x = 121,442.47
  5. Step 5: Solve for x
    x = 121,442.47/396.54
  6. Step 6: Final answer
    x = 306.26

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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.