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Finding the Third Proportional to 18,878 and 39,820

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Solution

The third proportional to 18,878 and 39,820 is: 83,993.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878 : 39,820 = 39,820 : x
  2. Step 2: Convert to fraction form
    18,878/39,820 = 39,820/x
  3. Step 3: Cross multiply
    18,878x = 39,820 × 39,820
  4. Step 4: Simplify right side
    18,878x = 1,585,632,400
  5. Step 5: Solve for x
    x = 1,585,632,400/18,878
  6. Step 6: Final answer
    x = 83,993.66

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.