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Finding the Third Proportional to 217.69 and 411.75

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Solution

The third proportional to 217.69 and 411.75 is: 778.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.69 : 411.75 = 411.75 : x
  2. Step 2: Convert to fraction form
    217.69/411.75 = 411.75/x
  3. Step 3: Cross multiply
    217.69x = 411.75 × 411.75
  4. Step 4: Simplify right side
    217.69x = 169,538.06
  5. Step 5: Solve for x
    x = 169,538.06/217.69
  6. Step 6: Final answer
    x = 778.81

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.