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Finding the Fourth Proportional to 239.97, 331.55 and 231.64

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Solution

The fourth proportional to 239.97, 331.55 and 231.64 is: 320.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.97 : 331.55 = 231.64 : x
  2. Step 2: Convert to fraction form
    239.97/331.55 = 231.64/x
  3. Step 3: Cross multiply
    239.97x = 331.55 × 231.64
  4. Step 4: Simplify right side
    239.97x = 76,800.24
  5. Step 5: Solve for x
    x = 76,800.24/239.97
  6. Step 6: Final answer
    x = 320.04

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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.