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Finding the Third Proportional to 12,708 and 18,990

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Solution

The third proportional to 12,708 and 18,990 is: 28,377.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,708 : 18,990 = 18,990 : x
  2. Step 2: Convert to fraction form
    12,708/18,990 = 18,990/x
  3. Step 3: Cross multiply
    12,708x = 18,990 × 18,990
  4. Step 4: Simplify right side
    12,708x = 360,620,100
  5. Step 5: Solve for x
    x = 360,620,100/12,708
  6. Step 6: Final answer
    x = 28,377.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.