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Finding the Fourth Proportional to 13.88, 20.85 and 12.97

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Solution

The fourth proportional to 13.88, 20.85 and 12.97 is: 19.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.88 : 20.85 = 12.97 : x
  2. Step 2: Convert to fraction form
    13.88/20.85 = 12.97/x
  3. Step 3: Cross multiply
    13.88x = 20.85 × 12.97
  4. Step 4: Simplify right side
    13.88x = 270.42
  5. Step 5: Solve for x
    x = 270.42/13.88
  6. Step 6: Final answer
    x = 19.48

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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.