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Finding the Fourth Proportional to 220.54, 330.71 and 129.28

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Solution

The fourth proportional to 220.54, 330.71 and 129.28 is: 193.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.54 : 330.71 = 129.28 : x
  2. Step 2: Convert to fraction form
    220.54/330.71 = 129.28/x
  3. Step 3: Cross multiply
    220.54x = 330.71 × 129.28
  4. Step 4: Simplify right side
    220.54x = 42,752.72
  5. Step 5: Solve for x
    x = 42,752.72/220.54
  6. Step 6: Final answer
    x = 193.86

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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.