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Finding the Fourth Proportional to 239.82, 328.12 and 238.92

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Solution

The fourth proportional to 239.82, 328.12 and 238.92 is: 326.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.82 : 328.12 = 238.92 : x
  2. Step 2: Convert to fraction form
    239.82/328.12 = 238.92/x
  3. Step 3: Cross multiply
    239.82x = 328.12 × 238.92
  4. Step 4: Simplify right side
    239.82x = 78,391.60
  5. Step 5: Solve for x
    x = 78,391.60/239.82
  6. Step 6: Final answer
    x = 326.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.