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Finding the Third Proportional to 256.50 and 329.25

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Solution

The third proportional to 256.50 and 329.25 is: 422.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.50 : 329.25 = 329.25 : x
  2. Step 2: Convert to fraction form
    256.50/329.25 = 329.25/x
  3. Step 3: Cross multiply
    256.50x = 329.25 × 329.25
  4. Step 4: Simplify right side
    256.50x = 108,405.56
  5. Step 5: Solve for x
    x = 108,405.56/256.50
  6. Step 6: Final answer
    x = 422.63

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.