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Finding the Third Proportional to 256.75 and 414.38

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Solution

The third proportional to 256.75 and 414.38 is: 668.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.75 : 414.38 = 414.38 : x
  2. Step 2: Convert to fraction form
    256.75/414.38 = 414.38/x
  3. Step 3: Cross multiply
    256.75x = 414.38 × 414.38
  4. Step 4: Simplify right side
    256.75x = 171,706.64
  5. Step 5: Solve for x
    x = 171,706.64/256.75
  6. Step 6: Final answer
    x = 668.77

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.