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Finding the Fourth Proportional to 239.70, 330.66 and 206.90

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Solution

The fourth proportional to 239.70, 330.66 and 206.90 is: 285.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.70 : 330.66 = 206.90 : x
  2. Step 2: Convert to fraction form
    239.70/330.66 = 206.90/x
  3. Step 3: Cross multiply
    239.70x = 330.66 × 206.90
  4. Step 4: Simplify right side
    239.70x = 68,413.55
  5. Step 5: Solve for x
    x = 68,413.55/239.70
  6. Step 6: Final answer
    x = 285.41

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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.