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Finding the Third Proportional to 76.89 and 168.99

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Solution

The third proportional to 76.89 and 168.99 is: 371.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.89 : 168.99 = 168.99 : x
  2. Step 2: Convert to fraction form
    76.89/168.99 = 168.99/x
  3. Step 3: Cross multiply
    76.89x = 168.99 × 168.99
  4. Step 4: Simplify right side
    76.89x = 28,557.82
  5. Step 5: Solve for x
    x = 28,557.82/76.89
  6. Step 6: Final answer
    x = 371.43

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.