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Finding the Fourth Proportional to 220.20, 329.88 and 123.72

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Solution

The fourth proportional to 220.20, 329.88 and 123.72 is: 185.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.20 : 329.88 = 123.72 : x
  2. Step 2: Convert to fraction form
    220.20/329.88 = 123.72/x
  3. Step 3: Cross multiply
    220.20x = 329.88 × 123.72
  4. Step 4: Simplify right side
    220.20x = 40,812.75
  5. Step 5: Solve for x
    x = 40,812.75/220.20
  6. Step 6: Final answer
    x = 185.34

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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.