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Finding the Third Proportional to 4 and 6.81

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Solution

The third proportional to 4 and 6.81 is: 11.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4 : 6.81 = 6.81 : x
  2. Step 2: Convert to fraction form
    4/6.81 = 6.81/x
  3. Step 3: Cross multiply
    4x = 6.81 × 6.81
  4. Step 4: Simplify right side
    4x = 46.41
  5. Step 5: Solve for x
    x = 46.41/4
  6. Step 6: Final answer
    x = 11.60

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.