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Finding the Third Proportional to 208 and 410.75

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Solution

The third proportional to 208 and 410.75 is: 811.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    208 : 410.75 = 410.75 : x
  2. Step 2: Convert to fraction form
    208/410.75 = 410.75/x
  3. Step 3: Cross multiply
    208x = 410.75 × 410.75
  4. Step 4: Simplify right side
    208x = 168,715.56
  5. Step 5: Solve for x
    x = 168,715.56/208
  6. Step 6: Final answer
    x = 811.13

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.