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Finding the Fourth Proportional to 220.32, 330.76 and 129.20

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Solution

The fourth proportional to 220.32, 330.76 and 129.20 is: 193.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.32 : 330.76 = 129.20 : x
  2. Step 2: Convert to fraction form
    220.32/330.76 = 129.20/x
  3. Step 3: Cross multiply
    220.32x = 330.76 × 129.20
  4. Step 4: Simplify right side
    220.32x = 42,734.19
  5. Step 5: Solve for x
    x = 42,734.19/220.32
  6. Step 6: Final answer
    x = 193.96

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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.