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Finding the Third Proportional to 3,078 and 3,969

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Solution

The third proportional to 3,078 and 3,969 is: 5,117.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078 : 3,969 = 3,969 : x
  2. Step 2: Convert to fraction form
    3,078/3,969 = 3,969/x
  3. Step 3: Cross multiply
    3,078x = 3,969 × 3,969
  4. Step 4: Simplify right side
    3,078x = 15,752,961
  5. Step 5: Solve for x
    x = 15,752,961/3,078
  6. Step 6: Final answer
    x = 5,117.92

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.