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Finding the Fourth Proportional to 396.25, 546.83 and 221.61

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Solution

The fourth proportional to 396.25, 546.83 and 221.61 is: 305.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.25 : 546.83 = 221.61 : x
  2. Step 2: Convert to fraction form
    396.25/546.83 = 221.61/x
  3. Step 3: Cross multiply
    396.25x = 546.83 × 221.61
  4. Step 4: Simplify right side
    396.25x = 121,183.00
  5. Step 5: Solve for x
    x = 121,183.00/396.25
  6. Step 6: Final answer
    x = 305.82

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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.