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Finding the Third Proportional to 687.38 and 1,503

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Solution

The third proportional to 687.38 and 1,503 is: 3,286.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.38 : 1,503 = 1,503 : x
  2. Step 2: Convert to fraction form
    687.38/1,503 = 1,503/x
  3. Step 3: Cross multiply
    687.38x = 1,503 × 1,503
  4. Step 4: Simplify right side
    687.38x = 2,259,009
  5. Step 5: Solve for x
    x = 2,259,009/687.38
  6. Step 6: Final answer
    x = 3,286.43

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.