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Finding the Third Proportional to 690.75 and 1,503

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Solution

The third proportional to 690.75 and 1,503 is: 3,270.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.75 : 1,503 = 1,503 : x
  2. Step 2: Convert to fraction form
    690.75/1,503 = 1,503/x
  3. Step 3: Cross multiply
    690.75x = 1,503 × 1,503
  4. Step 4: Simplify right side
    690.75x = 2,259,009
  5. Step 5: Solve for x
    x = 2,259,009/690.75
  6. Step 6: Final answer
    x = 3,270.37

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.