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Finding the Third Proportional to 20,140 and 38,821

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Solution

The third proportional to 20,140 and 38,821 is: 74,829.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,140 : 38,821 = 38,821 : x
  2. Step 2: Convert to fraction form
    20,140/38,821 = 38,821/x
  3. Step 3: Cross multiply
    20,140x = 38,821 × 38,821
  4. Step 4: Simplify right side
    20,140x = 1,507,070,041
  5. Step 5: Solve for x
    x = 1,507,070,041/20,140
  6. Step 6: Final answer
    x = 74,829.69

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Why These Related Problems?

These problems maintain the same ratio (1.93) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.