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Finding the Fourth Proportional to 396.50, 547.17 and 221.84

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Solution

The fourth proportional to 396.50, 547.17 and 221.84 is: 306.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.50 : 547.17 = 221.84 : x
  2. Step 2: Convert to fraction form
    396.50/547.17 = 221.84/x
  3. Step 3: Cross multiply
    396.50x = 547.17 × 221.84
  4. Step 4: Simplify right side
    396.50x = 121,384.19
  5. Step 5: Solve for x
    x = 121,384.19/396.50
  6. Step 6: Final answer
    x = 306.14

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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.