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Finding the Fourth Proportional to 396.21, 546.77 and 221.56

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Solution

The fourth proportional to 396.21, 546.77 and 221.56 is: 305.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.21 : 546.77 = 221.56 : x
  2. Step 2: Convert to fraction form
    396.21/546.77 = 221.56/x
  3. Step 3: Cross multiply
    396.21x = 546.77 × 221.56
  4. Step 4: Simplify right side
    396.21x = 121,142.36
  5. Step 5: Solve for x
    x = 121,142.36/396.21
  6. Step 6: Final answer
    x = 305.75

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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.