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Finding the Third Proportional to 76.81 and 166.31

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Solution

The third proportional to 76.81 and 166.31 is: 360.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.81 : 166.31 = 166.31 : x
  2. Step 2: Convert to fraction form
    76.81/166.31 = 166.31/x
  3. Step 3: Cross multiply
    76.81x = 166.31 × 166.31
  4. Step 4: Simplify right side
    76.81x = 27,659.85
  5. Step 5: Solve for x
    x = 27,659.85/76.81
  6. Step 6: Final answer
    x = 360.10

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.