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Finding the Fourth Proportional to 239.87, 331.21 and 195.61

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Solution

The fourth proportional to 239.87, 331.21 and 195.61 is: 270.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.87 : 331.21 = 195.61 : x
  2. Step 2: Convert to fraction form
    239.87/331.21 = 195.61/x
  3. Step 3: Cross multiply
    239.87x = 331.21 × 195.61
  4. Step 4: Simplify right side
    239.87x = 64,786.67
  5. Step 5: Solve for x
    x = 64,786.67/239.87
  6. Step 6: Final answer
    x = 270.10

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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.