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Finding the Third Proportional to 2,919 and 3,891

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Solution

The third proportional to 2,919 and 3,891 is: 5,186.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919 : 3,891 = 3,891 : x
  2. Step 2: Convert to fraction form
    2,919/3,891 = 3,891/x
  3. Step 3: Cross multiply
    2,919x = 3,891 × 3,891
  4. Step 4: Simplify right side
    2,919x = 15,139,881
  5. Step 5: Solve for x
    x = 15,139,881/2,919
  6. Step 6: Final answer
    x = 5,186.67

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.