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Finding the Fourth Proportional to 252.20, 347.49 and 231.20

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Solution

The fourth proportional to 252.20, 347.49 and 231.20 is: 318.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.20 : 347.49 = 231.20 : x
  2. Step 2: Convert to fraction form
    252.20/347.49 = 231.20/x
  3. Step 3: Cross multiply
    252.20x = 347.49 × 231.20
  4. Step 4: Simplify right side
    252.20x = 80,339.69
  5. Step 5: Solve for x
    x = 80,339.69/252.20
  6. Step 6: Final answer
    x = 318.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.