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Finding the Fourth Proportional to 220.96, 331.08 and 129.64

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Solution

The fourth proportional to 220.96, 331.08 and 129.64 is: 194.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.96 : 331.08 = 129.64 : x
  2. Step 2: Convert to fraction form
    220.96/331.08 = 129.64/x
  3. Step 3: Cross multiply
    220.96x = 331.08 × 129.64
  4. Step 4: Simplify right side
    220.96x = 42,921.21
  5. Step 5: Solve for x
    x = 42,921.21/220.96
  6. Step 6: Final answer
    x = 194.25

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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.