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Finding the Third Proportional to 638 and 991.50

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Solution

The third proportional to 638 and 991.50 is: 1,540.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    638 : 991.50 = 991.50 : x
  2. Step 2: Convert to fraction form
    638/991.50 = 991.50/x
  3. Step 3: Cross multiply
    638x = 991.50 × 991.50
  4. Step 4: Simplify right side
    638x = 983,072.25
  5. Step 5: Solve for x
    x = 983,072.25/638
  6. Step 6: Final answer
    x = 1,540.87

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.