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Finding the Third Proportional to 268.88 and 406.69

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Solution

The third proportional to 268.88 and 406.69 is: 615.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.88 : 406.69 = 406.69 : x
  2. Step 2: Convert to fraction form
    268.88/406.69 = 406.69/x
  3. Step 3: Cross multiply
    268.88x = 406.69 × 406.69
  4. Step 4: Simplify right side
    268.88x = 165,394.72
  5. Step 5: Solve for x
    x = 165,394.72/268.88
  6. Step 6: Final answer
    x = 615.14

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.