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Finding the Third Proportional to 243.25 and 391.25

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Solution

The third proportional to 243.25 and 391.25 is: 629.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.25 : 391.25 = 391.25 : x
  2. Step 2: Convert to fraction form
    243.25/391.25 = 391.25/x
  3. Step 3: Cross multiply
    243.25x = 391.25 × 391.25
  4. Step 4: Simplify right side
    243.25x = 153,076.56
  5. Step 5: Solve for x
    x = 153,076.56/243.25
  6. Step 6: Final answer
    x = 629.30

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.