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Finding the Third Proportional to 178.75 and 388.25

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Solution

The third proportional to 178.75 and 388.25 is: 843.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.75 : 388.25 = 388.25 : x
  2. Step 2: Convert to fraction form
    178.75/388.25 = 388.25/x
  3. Step 3: Cross multiply
    178.75x = 388.25 × 388.25
  4. Step 4: Simplify right side
    178.75x = 150,738.06
  5. Step 5: Solve for x
    x = 150,738.06/178.75
  6. Step 6: Final answer
    x = 843.29

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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.