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Finding the Fourth Proportional to 396.34, 546.96 and 221.68

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Solution

The fourth proportional to 396.34, 546.96 and 221.68 is: 305.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.34 : 546.96 = 221.68 : x
  2. Step 2: Convert to fraction form
    396.34/546.96 = 221.68/x
  3. Step 3: Cross multiply
    396.34x = 546.96 × 221.68
  4. Step 4: Simplify right side
    396.34x = 121,250.09
  5. Step 5: Solve for x
    x = 121,250.09/396.34
  6. Step 6: Final answer
    x = 305.92

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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.