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Finding the Third Proportional to 518 and 718

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Solution

The third proportional to 518 and 718 is: 995.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 718 = 718 : x
  2. Step 2: Convert to fraction form
    518/718 = 718/x
  3. Step 3: Cross multiply
    518x = 718 × 718
  4. Step 4: Simplify right side
    518x = 515,524
  5. Step 5: Solve for x
    x = 515,524/518
  6. Step 6: Final answer
    x = 995.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.