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Finding the Third Proportional to 5,615 and 8,809

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Solution

The third proportional to 5,615 and 8,809 is: 13,819.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,615 : 8,809 = 8,809 : x
  2. Step 2: Convert to fraction form
    5,615/8,809 = 8,809/x
  3. Step 3: Cross multiply
    5,615x = 8,809 × 8,809
  4. Step 4: Simplify right side
    5,615x = 77,598,481
  5. Step 5: Solve for x
    x = 77,598,481/5,615
  6. Step 6: Final answer
    x = 13,819.85

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.