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Finding the Fourth Proportional to 12.39, 17.06 and 9.60

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Solution

The fourth proportional to 12.39, 17.06 and 9.60 is: 13.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.39 : 17.06 = 9.60 : x
  2. Step 2: Convert to fraction form
    12.39/17.06 = 9.60/x
  3. Step 3: Cross multiply
    12.39x = 17.06 × 9.60
  4. Step 4: Simplify right side
    12.39x = 163.73
  5. Step 5: Solve for x
    x = 163.73/12.39
  6. Step 6: Final answer
    x = 13.21

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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.