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Finding the Third Proportional to 20.99 and 43.90

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Solution

The third proportional to 20.99 and 43.90 is: 91.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.99 : 43.90 = 43.90 : x
  2. Step 2: Convert to fraction form
    20.99/43.90 = 43.90/x
  3. Step 3: Cross multiply
    20.99x = 43.90 × 43.90
  4. Step 4: Simplify right side
    20.99x = 1,927.33
  5. Step 5: Solve for x
    x = 1,927.33/20.99
  6. Step 6: Final answer
    x = 91.83

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.