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Finding the Third Proportional to 18,981 and 36,140

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Solution

The third proportional to 18,981 and 36,140 is: 68,810.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981 : 36,140 = 36,140 : x
  2. Step 2: Convert to fraction form
    18,981/36,140 = 36,140/x
  3. Step 3: Cross multiply
    18,981x = 36,140 × 36,140
  4. Step 4: Simplify right side
    18,981x = 1,306,099,600
  5. Step 5: Solve for x
    x = 1,306,099,600/18,981
  6. Step 6: Final answer
    x = 68,810.90

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.