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Finding the Third Proportional to 285 and 426

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Solution

The third proportional to 285 and 426 is: 636.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 426 = 426 : x
  2. Step 2: Convert to fraction form
    285/426 = 426/x
  3. Step 3: Cross multiply
    285x = 426 × 426
  4. Step 4: Simplify right side
    285x = 181,476
  5. Step 5: Solve for x
    x = 181,476/285
  6. Step 6: Final answer
    x = 636.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.