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Finding the Fourth Proportional to 396.53, 547.16 and 221.87

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Solution

The fourth proportional to 396.53, 547.16 and 221.87 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.53 : 547.16 = 221.87 : x
  2. Step 2: Convert to fraction form
    396.53/547.16 = 221.87/x
  3. Step 3: Cross multiply
    396.53x = 547.16 × 221.87
  4. Step 4: Simplify right side
    396.53x = 121,397.28
  5. Step 5: Solve for x
    x = 121,397.28/396.53
  6. Step 6: Final answer
    x = 306.15

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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.