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Finding the Third Proportional to 427.78 and 648.21

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Solution

The third proportional to 427.78 and 648.21 is: 982.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.78 : 648.21 = 648.21 : x
  2. Step 2: Convert to fraction form
    427.78/648.21 = 648.21/x
  3. Step 3: Cross multiply
    427.78x = 648.21 × 648.21
  4. Step 4: Simplify right side
    427.78x = 420,177.42
  5. Step 5: Solve for x
    x = 420,177.42/427.78
  6. Step 6: Final answer
    x = 982.22

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.