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Finding the Fourth Proportional to 220.15, 329.56 and 142.89

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Solution

The fourth proportional to 220.15, 329.56 and 142.89 is: 213.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.15 : 329.56 = 142.89 : x
  2. Step 2: Convert to fraction form
    220.15/329.56 = 142.89/x
  3. Step 3: Cross multiply
    220.15x = 329.56 × 142.89
  4. Step 4: Simplify right side
    220.15x = 47,089.18
  5. Step 5: Solve for x
    x = 47,089.18/220.15
  6. Step 6: Final answer
    x = 213.90

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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.