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Finding the Third Proportional to 308 and 422

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Solution

The third proportional to 308 and 422 is: 578.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    308 : 422 = 422 : x
  2. Step 2: Convert to fraction form
    308/422 = 422/x
  3. Step 3: Cross multiply
    308x = 422 × 422
  4. Step 4: Simplify right side
    308x = 178,084
  5. Step 5: Solve for x
    x = 178,084/308
  6. Step 6: Final answer
    x = 578.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.