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Finding the Third Proportional to 2,919 and 6,978

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Solution

The third proportional to 2,919 and 6,978 is: 16,681.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919 : 6,978 = 6,978 : x
  2. Step 2: Convert to fraction form
    2,919/6,978 = 6,978/x
  3. Step 3: Cross multiply
    2,919x = 6,978 × 6,978
  4. Step 4: Simplify right side
    2,919x = 48,692,484
  5. Step 5: Solve for x
    x = 48,692,484/2,919
  6. Step 6: Final answer
    x = 16,681.22

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.