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Finding the Third Proportional to 8,690 and 18,112

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Solution

The third proportional to 8,690 and 18,112 is: 37,749.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690 : 18,112 = 18,112 : x
  2. Step 2: Convert to fraction form
    8,690/18,112 = 18,112/x
  3. Step 3: Cross multiply
    8,690x = 18,112 × 18,112
  4. Step 4: Simplify right side
    8,690x = 328,044,544
  5. Step 5: Solve for x
    x = 328,044,544/8,690
  6. Step 6: Final answer
    x = 37,749.66

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.