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Finding the Third Proportional to 18,612 and 38,211

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Solution

The third proportional to 18,612 and 38,211 is: 78,448.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612 : 38,211 = 38,211 : x
  2. Step 2: Convert to fraction form
    18,612/38,211 = 38,211/x
  3. Step 3: Cross multiply
    18,612x = 38,211 × 38,211
  4. Step 4: Simplify right side
    18,612x = 1,460,080,521
  5. Step 5: Solve for x
    x = 1,460,080,521/18,612
  6. Step 6: Final answer
    x = 78,448.34

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.