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Finding the Fourth Proportional to 331.82, 458.27 and 221.76

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Solution

The fourth proportional to 331.82, 458.27 and 221.76 is: 306.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.82 : 458.27 = 221.76 : x
  2. Step 2: Convert to fraction form
    331.82/458.27 = 221.76/x
  3. Step 3: Cross multiply
    331.82x = 458.27 × 221.76
  4. Step 4: Simplify right side
    331.82x = 101,625.96
  5. Step 5: Solve for x
    x = 101,625.96/331.82
  6. Step 6: Final answer
    x = 306.27

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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.