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Finding the Third Proportional to 1,691 and 3,635

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Solution

The third proportional to 1,691 and 3,635 is: 7,813.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691 : 3,635 = 3,635 : x
  2. Step 2: Convert to fraction form
    1,691/3,635 = 3,635/x
  3. Step 3: Cross multiply
    1,691x = 3,635 × 3,635
  4. Step 4: Simplify right side
    1,691x = 13,213,225
  5. Step 5: Solve for x
    x = 13,213,225/1,691
  6. Step 6: Final answer
    x = 7,813.85

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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.