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Finding the Third Proportional to 20,855 and 43,438

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Solution

The third proportional to 20,855 and 43,438 is: 90,475.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855 : 43,438 = 43,438 : x
  2. Step 2: Convert to fraction form
    20,855/43,438 = 43,438/x
  3. Step 3: Cross multiply
    20,855x = 43,438 × 43,438
  4. Step 4: Simplify right side
    20,855x = 1,886,859,844
  5. Step 5: Solve for x
    x = 1,886,859,844/20,855
  6. Step 6: Final answer
    x = 90,475.18

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.