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Finding the Third Proportional to 12,690 and 18,620

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Solution

The third proportional to 12,690 and 18,620 is: 27,321.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690 : 18,620 = 18,620 : x
  2. Step 2: Convert to fraction form
    12,690/18,620 = 18,620/x
  3. Step 3: Cross multiply
    12,690x = 18,620 × 18,620
  4. Step 4: Simplify right side
    12,690x = 346,704,400
  5. Step 5: Solve for x
    x = 346,704,400/12,690
  6. Step 6: Final answer
    x = 27,321.07

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.