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Finding the Third Proportional to 16,890 and 18,690

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Solution

The third proportional to 16,890 and 18,690 is: 20,681.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,890 : 18,690 = 18,690 : x
  2. Step 2: Convert to fraction form
    16,890/18,690 = 18,690/x
  3. Step 3: Cross multiply
    16,890x = 18,690 × 18,690
  4. Step 4: Simplify right side
    16,890x = 349,316,100
  5. Step 5: Solve for x
    x = 349,316,100/16,890
  6. Step 6: Final answer
    x = 20,681.83

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.