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Finding the Third Proportional to 399 and 426

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Solution

The third proportional to 399 and 426 is: 454.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    399 : 426 = 426 : x
  2. Step 2: Convert to fraction form
    399/426 = 426/x
  3. Step 3: Cross multiply
    399x = 426 × 426
  4. Step 4: Simplify right side
    399x = 181,476
  5. Step 5: Solve for x
    x = 181,476/399
  6. Step 6: Final answer
    x = 454.83

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.