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Finding the Third Proportional to 6.21 and 13.81

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Solution

The third proportional to 6.21 and 13.81 is: 30.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.21 : 13.81 = 13.81 : x
  2. Step 2: Convert to fraction form
    6.21/13.81 = 13.81/x
  3. Step 3: Cross multiply
    6.21x = 13.81 × 13.81
  4. Step 4: Simplify right side
    6.21x = 190.70
  5. Step 5: Solve for x
    x = 190.70/6.21
  6. Step 6: Final answer
    x = 30.71

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.