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Finding the Third Proportional to 215.75 and 285.25

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Solution

The third proportional to 215.75 and 285.25 is: 377.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.75 : 285.25 = 285.25 : x
  2. Step 2: Convert to fraction form
    215.75/285.25 = 285.25/x
  3. Step 3: Cross multiply
    215.75x = 285.25 × 285.25
  4. Step 4: Simplify right side
    215.75x = 81,367.56
  5. Step 5: Solve for x
    x = 81,367.56/215.75
  6. Step 6: Final answer
    x = 377.14

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.