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Finding the Fourth Proportional to 331.97, 458.30 and 221.81

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Solution

The fourth proportional to 331.97, 458.30 and 221.81 is: 306.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.97 : 458.30 = 221.81 : x
  2. Step 2: Convert to fraction form
    331.97/458.30 = 221.81/x
  3. Step 3: Cross multiply
    331.97x = 458.30 × 221.81
  4. Step 4: Simplify right side
    331.97x = 101,653.79
  5. Step 5: Solve for x
    x = 101,653.79/331.97
  6. Step 6: Final answer
    x = 306.22

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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.