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Finding the Fourth Proportional to 243.28, 363.20 and 220.60

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Solution

The fourth proportional to 243.28, 363.20 and 220.60 is: 329.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.28 : 363.20 = 220.60 : x
  2. Step 2: Convert to fraction form
    243.28/363.20 = 220.60/x
  3. Step 3: Cross multiply
    243.28x = 363.20 × 220.60
  4. Step 4: Simplify right side
    243.28x = 80,121.92
  5. Step 5: Solve for x
    x = 80,121.92/243.28
  6. Step 6: Final answer
    x = 329.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.