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Finding the Third Proportional to 74.75 and 178.63

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Solution

The third proportional to 74.75 and 178.63 is: 426.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.75 : 178.63 = 178.63 : x
  2. Step 2: Convert to fraction form
    74.75/178.63 = 178.63/x
  3. Step 3: Cross multiply
    74.75x = 178.63 × 178.63
  4. Step 4: Simplify right side
    74.75x = 31,906.89
  5. Step 5: Solve for x
    x = 31,906.89/74.75
  6. Step 6: Final answer
    x = 426.85

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.