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Finding the Third Proportional to 2,778 and 6,621

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Solution

The third proportional to 2,778 and 6,621 is: 15,780.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778 : 6,621 = 6,621 : x
  2. Step 2: Convert to fraction form
    2,778/6,621 = 6,621/x
  3. Step 3: Cross multiply
    2,778x = 6,621 × 6,621
  4. Step 4: Simplify right side
    2,778x = 43,837,641
  5. Step 5: Solve for x
    x = 43,837,641/2,778
  6. Step 6: Final answer
    x = 15,780.29

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.