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Finding the Fourth Proportional to 239.39, 329.83 and 217.55

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Solution

The fourth proportional to 239.39, 329.83 and 217.55 is: 299.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.39 : 329.83 = 217.55 : x
  2. Step 2: Convert to fraction form
    239.39/329.83 = 217.55/x
  3. Step 3: Cross multiply
    239.39x = 329.83 × 217.55
  4. Step 4: Simplify right side
    239.39x = 71,754.52
  5. Step 5: Solve for x
    x = 71,754.52/239.39
  6. Step 6: Final answer
    x = 299.74

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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.