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Finding the Third Proportional to 254.39 and 396.77

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Solution

The third proportional to 254.39 and 396.77 is: 618.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.39 : 396.77 = 396.77 : x
  2. Step 2: Convert to fraction form
    254.39/396.77 = 396.77/x
  3. Step 3: Cross multiply
    254.39x = 396.77 × 396.77
  4. Step 4: Simplify right side
    254.39x = 157,429.16
  5. Step 5: Solve for x
    x = 157,429.16/254.39
  6. Step 6: Final answer
    x = 618.85

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.