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Finding the Third Proportional to 2.05 and 2.79

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Solution

The third proportional to 2.05 and 2.79 is: 3.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.05 : 2.79 = 2.79 : x
  2. Step 2: Convert to fraction form
    2.05/2.79 = 2.79/x
  3. Step 3: Cross multiply
    2.05x = 2.79 × 2.79
  4. Step 4: Simplify right side
    2.05x = 7.80
  5. Step 5: Solve for x
    x = 7.80/2.05
  6. Step 6: Final answer
    x = 3.81

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.