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Finding the Third Proportional to 8,690 and 18,778

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Solution

The third proportional to 8,690 and 18,778 is: 40,576.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690 : 18,778 = 18,778 : x
  2. Step 2: Convert to fraction form
    8,690/18,778 = 18,778/x
  3. Step 3: Cross multiply
    8,690x = 18,778 × 18,778
  4. Step 4: Simplify right side
    8,690x = 352,613,284
  5. Step 5: Solve for x
    x = 352,613,284/8,690
  6. Step 6: Final answer
    x = 40,576.90

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.