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Finding the Third Proportional to 76.89 and 163.38

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Solution

The third proportional to 76.89 and 163.38 is: 347.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.89 : 163.38 = 163.38 : x
  2. Step 2: Convert to fraction form
    76.89/163.38 = 163.38/x
  3. Step 3: Cross multiply
    76.89x = 163.38 × 163.38
  4. Step 4: Simplify right side
    76.89x = 26,694.42
  5. Step 5: Solve for x
    x = 26,694.42/76.89
  6. Step 6: Final answer
    x = 347.19

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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.