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Finding the Third Proportional to 217 and 320.75

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Solution

The third proportional to 217 and 320.75 is: 474.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    217 : 320.75 = 320.75 : x
  2. Step 2: Convert to fraction form
    217/320.75 = 320.75/x
  3. Step 3: Cross multiply
    217x = 320.75 × 320.75
  4. Step 4: Simplify right side
    217x = 102,880.56
  5. Step 5: Solve for x
    x = 102,880.56/217
  6. Step 6: Final answer
    x = 474.10

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.