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Finding the Fourth Proportional to 243.20, 333.60 and 220.80

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Solution

The fourth proportional to 243.20, 333.60 and 220.80 is: 302.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.20 : 333.60 = 220.80 : x
  2. Step 2: Convert to fraction form
    243.20/333.60 = 220.80/x
  3. Step 3: Cross multiply
    243.20x = 333.60 × 220.80
  4. Step 4: Simplify right side
    243.20x = 73,658.88
  5. Step 5: Solve for x
    x = 73,658.88/243.20
  6. Step 6: Final answer
    x = 302.87

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.