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Finding the Third Proportional to 638 and 1,335

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Solution

The third proportional to 638 and 1,335 is: 2,793.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    638 : 1,335 = 1,335 : x
  2. Step 2: Convert to fraction form
    638/1,335 = 1,335/x
  3. Step 3: Cross multiply
    638x = 1,335 × 1,335
  4. Step 4: Simplify right side
    638x = 1,782,225
  5. Step 5: Solve for x
    x = 1,782,225/638
  6. Step 6: Final answer
    x = 2,793.46

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.