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Finding the Fourth Proportional to 252.12, 347.90 and 231.48

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Solution

The fourth proportional to 252.12, 347.90 and 231.48 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.12 : 347.90 = 231.48 : x
  2. Step 2: Convert to fraction form
    252.12/347.90 = 231.48/x
  3. Step 3: Cross multiply
    252.12x = 347.90 × 231.48
  4. Step 4: Simplify right side
    252.12x = 80,531.89
  5. Step 5: Solve for x
    x = 80,531.89/252.12
  6. Step 6: Final answer
    x = 319.42

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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.