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Finding the Fourth Proportional to 238.90, 331.35 and 229.18

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Solution

The fourth proportional to 238.90, 331.35 and 229.18 is: 317.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.90 : 331.35 = 229.18 : x
  2. Step 2: Convert to fraction form
    238.90/331.35 = 229.18/x
  3. Step 3: Cross multiply
    238.90x = 331.35 × 229.18
  4. Step 4: Simplify right side
    238.90x = 75,937.14
  5. Step 5: Solve for x
    x = 75,937.14/238.90
  6. Step 6: Final answer
    x = 317.87

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.