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Finding the Fourth Proportional to 239.21, 329.97 and 206.40

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Solution

The fourth proportional to 239.21, 329.97 and 206.40 is: 284.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.21 : 329.97 = 206.40 : x
  2. Step 2: Convert to fraction form
    239.21/329.97 = 206.40/x
  3. Step 3: Cross multiply
    239.21x = 329.97 × 206.40
  4. Step 4: Simplify right side
    239.21x = 68,105.81
  5. Step 5: Solve for x
    x = 68,105.81/239.21
  6. Step 6: Final answer
    x = 284.72

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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.