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Finding the Third Proportional to 217.25 and 312.25

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Solution

The third proportional to 217.25 and 312.25 is: 448.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.25 : 312.25 = 312.25 : x
  2. Step 2: Convert to fraction form
    217.25/312.25 = 312.25/x
  3. Step 3: Cross multiply
    217.25x = 312.25 × 312.25
  4. Step 4: Simplify right side
    217.25x = 97,500.06
  5. Step 5: Solve for x
    x = 97,500.06/217.25
  6. Step 6: Final answer
    x = 448.79

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.