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Finding the Third Proportional to 217 and 479.50

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Solution

The third proportional to 217 and 479.50 is: 1,059.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217 : 479.50 = 479.50 : x
  2. Step 2: Convert to fraction form
    217/479.50 = 479.50/x
  3. Step 3: Cross multiply
    217x = 479.50 × 479.50
  4. Step 4: Simplify right side
    217x = 229,920.25
  5. Step 5: Solve for x
    x = 229,920.25/217
  6. Step 6: Final answer
    x = 1,059.54

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.