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Finding the Fourth Proportional to 239.22, 331.56 and 235.31

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Solution

The fourth proportional to 239.22, 331.56 and 235.31 is: 326.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.22 : 331.56 = 235.31 : x
  2. Step 2: Convert to fraction form
    239.22/331.56 = 235.31/x
  3. Step 3: Cross multiply
    239.22x = 331.56 × 235.31
  4. Step 4: Simplify right side
    239.22x = 78,017.73
  5. Step 5: Solve for x
    x = 78,017.73/239.22
  6. Step 6: Final answer
    x = 326.13

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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.