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Finding the Third Proportional to 638.25 and 1,488

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Solution

The third proportional to 638.25 and 1,488 is: 3,469.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.25 : 1,488 = 1,488 : x
  2. Step 2: Convert to fraction form
    638.25/1,488 = 1,488/x
  3. Step 3: Cross multiply
    638.25x = 1,488 × 1,488
  4. Step 4: Simplify right side
    638.25x = 2,214,144
  5. Step 5: Solve for x
    x = 2,214,144/638.25
  6. Step 6: Final answer
    x = 3,469.09

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Why These Related Problems?

These problems maintain the same ratio (2.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.