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Finding the Third Proportional to 388.50 and 648.75

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Solution

The third proportional to 388.50 and 648.75 is: 1,083.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.50 : 648.75 = 648.75 : x
  2. Step 2: Convert to fraction form
    388.50/648.75 = 648.75/x
  3. Step 3: Cross multiply
    388.50x = 648.75 × 648.75
  4. Step 4: Simplify right side
    388.50x = 420,876.56
  5. Step 5: Solve for x
    x = 420,876.56/388.50
  6. Step 6: Final answer
    x = 1,083.34

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.