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Finding the Third Proportional to 1,309 and 2,809

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Solution

The third proportional to 1,309 and 2,809 is: 6,027.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309 : 2,809 = 2,809 : x
  2. Step 2: Convert to fraction form
    1,309/2,809 = 2,809/x
  3. Step 3: Cross multiply
    1,309x = 2,809 × 2,809
  4. Step 4: Simplify right side
    1,309x = 7,890,481
  5. Step 5: Solve for x
    x = 7,890,481/1,309
  6. Step 6: Final answer
    x = 6,027.87

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.