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Finding the Third Proportional to 77.81 and 165.19

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Solution

The third proportional to 77.81 and 165.19 is: 350.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.81 : 165.19 = 165.19 : x
  2. Step 2: Convert to fraction form
    77.81/165.19 = 165.19/x
  3. Step 3: Cross multiply
    77.81x = 165.19 × 165.19
  4. Step 4: Simplify right side
    77.81x = 27,286.91
  5. Step 5: Solve for x
    x = 27,286.91/77.81
  6. Step 6: Final answer
    x = 350.68

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.