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Finding the Third Proportional to 3,120.75 and 6,879.38

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Solution

The third proportional to 3,120.75 and 6,879.38 is: 15,164.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.75 : 6,879.38 = 6,879.38 : x
  2. Step 2: Convert to fraction form
    3,120.75/6,879.38 = 6,879.38/x
  3. Step 3: Cross multiply
    3,120.75x = 6,879.38 × 6,879.38
  4. Step 4: Simplify right side
    3,120.75x = 47,325,800.39
  5. Step 5: Solve for x
    x = 47,325,800.39/3,120.75
  6. Step 6: Final answer
    x = 15,164.88

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.