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Finding the Fourth Proportional to 20.39, 30.60 and 13.61

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Solution

The fourth proportional to 20.39, 30.60 and 13.61 is: 20.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.39 : 30.60 = 13.61 : x
  2. Step 2: Convert to fraction form
    20.39/30.60 = 13.61/x
  3. Step 3: Cross multiply
    20.39x = 30.60 × 13.61
  4. Step 4: Simplify right side
    20.39x = 416.47
  5. Step 5: Solve for x
    x = 416.47/20.39
  6. Step 6: Final answer
    x = 20.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.