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Finding the Third Proportional to 2,991 and 7,419

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Solution

The third proportional to 2,991 and 7,419 is: 18,402.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991 : 7,419 = 7,419 : x
  2. Step 2: Convert to fraction form
    2,991/7,419 = 7,419/x
  3. Step 3: Cross multiply
    2,991x = 7,419 × 7,419
  4. Step 4: Simplify right side
    2,991x = 55,041,561
  5. Step 5: Solve for x
    x = 55,041,561/2,991
  6. Step 6: Final answer
    x = 18,402.39

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Why These Related Problems?

These problems maintain the same ratio (2.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.