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Finding the Fourth Proportional to 396.10, 546.54 and 221.42

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Solution

The fourth proportional to 396.10, 546.54 and 221.42 is: 305.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.10 : 546.54 = 221.42 : x
  2. Step 2: Convert to fraction form
    396.10/546.54 = 221.42/x
  3. Step 3: Cross multiply
    396.10x = 546.54 × 221.42
  4. Step 4: Simplify right side
    396.10x = 121,014.89
  5. Step 5: Solve for x
    x = 121,014.89/396.10
  6. Step 6: Final answer
    x = 305.52

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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.