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Finding the Third Proportional to 638.30 and 1,517.91

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Solution

The third proportional to 638.30 and 1,517.91 is: 3,609.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.30 : 1,517.91 = 1,517.91 : x
  2. Step 2: Convert to fraction form
    638.30/1,517.91 = 1,517.91/x
  3. Step 3: Cross multiply
    638.30x = 1,517.91 × 1,517.91
  4. Step 4: Simplify right side
    638.30x = 2,304,039.38
  5. Step 5: Solve for x
    x = 2,304,039.38/638.30
  6. Step 6: Final answer
    x = 3,609.67

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.