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Finding the Fourth Proportional to 220.58, 331.01 and 129.14

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Solution

The fourth proportional to 220.58, 331.01 and 129.14 is: 193.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.58 : 331.01 = 129.14 : x
  2. Step 2: Convert to fraction form
    220.58/331.01 = 129.14/x
  3. Step 3: Cross multiply
    220.58x = 331.01 × 129.14
  4. Step 4: Simplify right side
    220.58x = 42,744.33
  5. Step 5: Solve for x
    x = 42,744.33/220.58
  6. Step 6: Final answer
    x = 193.79

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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.