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Finding the Fourth Proportional to 220.96, 331.32 and 105.43

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Solution

The fourth proportional to 220.96, 331.32 and 105.43 is: 158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.96 : 331.32 = 105.43 : x
  2. Step 2: Convert to fraction form
    220.96/331.32 = 105.43/x
  3. Step 3: Cross multiply
    220.96x = 331.32 × 105.43
  4. Step 4: Simplify right side
    220.96x = 34,930.66
  5. Step 5: Solve for x
    x = 34,930.66/220.96
  6. Step 6: Final answer
    x = 158.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.