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Finding the Fourth Proportional to 396.27, 546.84 and 221.58

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Solution

The fourth proportional to 396.27, 546.84 and 221.58 is: 305.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.27 : 546.84 = 221.58 : x
  2. Step 2: Convert to fraction form
    396.27/546.84 = 221.58/x
  3. Step 3: Cross multiply
    396.27x = 546.84 × 221.58
  4. Step 4: Simplify right side
    396.27x = 121,168.81
  5. Step 5: Solve for x
    x = 121,168.81/396.27
  6. Step 6: Final answer
    x = 305.77

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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.