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Finding the Third Proportional to 639.50 and 1,275

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Solution

The third proportional to 639.50 and 1,275 is: 2,542.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.50 : 1,275 = 1,275 : x
  2. Step 2: Convert to fraction form
    639.50/1,275 = 1,275/x
  3. Step 3: Cross multiply
    639.50x = 1,275 × 1,275
  4. Step 4: Simplify right side
    639.50x = 1,625,625
  5. Step 5: Solve for x
    x = 1,625,625/639.50
  6. Step 6: Final answer
    x = 2,542.03

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Why These Related Problems?

These problems maintain the same ratio (1.99) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.