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Finding the Third Proportional to 256.13 and 393.94

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Solution

The third proportional to 256.13 and 393.94 is: 605.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.13 : 393.94 = 393.94 : x
  2. Step 2: Convert to fraction form
    256.13/393.94 = 393.94/x
  3. Step 3: Cross multiply
    256.13x = 393.94 × 393.94
  4. Step 4: Simplify right side
    256.13x = 155,186.75
  5. Step 5: Solve for x
    x = 155,186.75/256.13
  6. Step 6: Final answer
    x = 605.90

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.