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Finding the Third Proportional to 217.75 and 302.75

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Solution

The third proportional to 217.75 and 302.75 is: 420.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.75 : 302.75 = 302.75 : x
  2. Step 2: Convert to fraction form
    217.75/302.75 = 302.75/x
  3. Step 3: Cross multiply
    217.75x = 302.75 × 302.75
  4. Step 4: Simplify right side
    217.75x = 91,657.56
  5. Step 5: Solve for x
    x = 91,657.56/217.75
  6. Step 6: Final answer
    x = 420.93

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.