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Finding the Third Proportional to 255.06 and 396.19

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Solution

The third proportional to 255.06 and 396.19 is: 615.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.06 : 396.19 = 396.19 : x
  2. Step 2: Convert to fraction form
    255.06/396.19 = 396.19/x
  3. Step 3: Cross multiply
    255.06x = 396.19 × 396.19
  4. Step 4: Simplify right side
    255.06x = 156,964.54
  5. Step 5: Solve for x
    x = 156,964.54/255.06
  6. Step 6: Final answer
    x = 615.40

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.