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Finding the Third Proportional to 215.75 and 248.75

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Solution

The third proportional to 215.75 and 248.75 is: 286.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.75 : 248.75 = 248.75 : x
  2. Step 2: Convert to fraction form
    215.75/248.75 = 248.75/x
  3. Step 3: Cross multiply
    215.75x = 248.75 × 248.75
  4. Step 4: Simplify right side
    215.75x = 61,876.56
  5. Step 5: Solve for x
    x = 61,876.56/215.75
  6. Step 6: Final answer
    x = 286.80

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.