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Finding the Third Proportional to 8,691 and 18,858

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Solution

The third proportional to 8,691 and 18,858 is: 40,918.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691 : 18,858 = 18,858 : x
  2. Step 2: Convert to fraction form
    8,691/18,858 = 18,858/x
  3. Step 3: Cross multiply
    8,691x = 18,858 × 18,858
  4. Step 4: Simplify right side
    8,691x = 355,624,164
  5. Step 5: Solve for x
    x = 355,624,164/8,691
  6. Step 6: Final answer
    x = 40,918.67

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.