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Finding the Fourth Proportional to 220.10, 330.17 and 128.80

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Solution

The fourth proportional to 220.10, 330.17 and 128.80 is: 193.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.10 : 330.17 = 128.80 : x
  2. Step 2: Convert to fraction form
    220.10/330.17 = 128.80/x
  3. Step 3: Cross multiply
    220.10x = 330.17 × 128.80
  4. Step 4: Simplify right side
    220.10x = 42,525.66
  5. Step 5: Solve for x
    x = 42,525.66/220.10
  6. Step 6: Final answer
    x = 193.22

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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.