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Finding the Third Proportional to 257 and 286

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Solution

The third proportional to 257 and 286 is: 318.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    257 : 286 = 286 : x
  2. Step 2: Convert to fraction form
    257/286 = 286/x
  3. Step 3: Cross multiply
    257x = 286 × 286
  4. Step 4: Simplify right side
    257x = 81,796
  5. Step 5: Solve for x
    x = 81,796/257
  6. Step 6: Final answer
    x = 318.27

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.