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Finding the Third Proportional to 388.97 and 400.78

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Solution

The third proportional to 388.97 and 400.78 is: 412.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.97 : 400.78 = 400.78 : x
  2. Step 2: Convert to fraction form
    388.97/400.78 = 400.78/x
  3. Step 3: Cross multiply
    388.97x = 400.78 × 400.78
  4. Step 4: Simplify right side
    388.97x = 160,625.61
  5. Step 5: Solve for x
    x = 160,625.61/388.97
  6. Step 6: Final answer
    x = 412.95

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.