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Finding the Third Proportional to 18,220 and 39,819

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Solution

The third proportional to 18,220 and 39,819 is: 87,022.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,220 : 39,819 = 39,819 : x
  2. Step 2: Convert to fraction form
    18,220/39,819 = 39,819/x
  3. Step 3: Cross multiply
    18,220x = 39,819 × 39,819
  4. Step 4: Simplify right side
    18,220x = 1,585,552,761
  5. Step 5: Solve for x
    x = 1,585,552,761/18,220
  6. Step 6: Final answer
    x = 87,022.65

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.