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Finding the Third Proportional to 249.75 and 317.11

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Solution

The third proportional to 249.75 and 317.11 is: 402.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.75 : 317.11 = 317.11 : x
  2. Step 2: Convert to fraction form
    249.75/317.11 = 317.11/x
  3. Step 3: Cross multiply
    249.75x = 317.11 × 317.11
  4. Step 4: Simplify right side
    249.75x = 100,558.36
  5. Step 5: Solve for x
    x = 100,558.36/249.75
  6. Step 6: Final answer
    x = 402.64

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.