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Finding the Third Proportional to 686 and 1,105

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Solution

The third proportional to 686 and 1,105 is: 1,779.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    686 : 1,105 = 1,105 : x
  2. Step 2: Convert to fraction form
    686/1,105 = 1,105/x
  3. Step 3: Cross multiply
    686x = 1,105 × 1,105
  4. Step 4: Simplify right side
    686x = 1,221,025
  5. Step 5: Solve for x
    x = 1,221,025/686
  6. Step 6: Final answer
    x = 1,779.92

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.