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Finding the Third Proportional to 18,990 and 39,195

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Solution

The third proportional to 18,990 and 39,195 is: 80,897.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990 : 39,195 = 39,195 : x
  2. Step 2: Convert to fraction form
    18,990/39,195 = 39,195/x
  3. Step 3: Cross multiply
    18,990x = 39,195 × 39,195
  4. Step 4: Simplify right side
    18,990x = 1,536,248,025
  5. Step 5: Solve for x
    x = 1,536,248,025/18,990
  6. Step 6: Final answer
    x = 80,897.74

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.