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Finding the Third Proportional to 387.25 and 789.88

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Solution

The third proportional to 387.25 and 789.88 is: 1,611.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.25 : 789.88 = 789.88 : x
  2. Step 2: Convert to fraction form
    387.25/789.88 = 789.88/x
  3. Step 3: Cross multiply
    387.25x = 789.88 × 789.88
  4. Step 4: Simplify right side
    387.25x = 623,902.52
  5. Step 5: Solve for x
    x = 623,902.52/387.25
  6. Step 6: Final answer
    x = 1,611.11

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.