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Finding the Fourth Proportional to 220.63, 331.17 and 128.09

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Solution

The fourth proportional to 220.63, 331.17 and 128.09 is: 192.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.63 : 331.17 = 128.09 : x
  2. Step 2: Convert to fraction form
    220.63/331.17 = 128.09/x
  3. Step 3: Cross multiply
    220.63x = 331.17 × 128.09
  4. Step 4: Simplify right side
    220.63x = 42,419.57
  5. Step 5: Solve for x
    x = 42,419.57/220.63
  6. Step 6: Final answer
    x = 192.27

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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.