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Finding the Third Proportional to 321.38 and 692.75

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Solution

The third proportional to 321.38 and 692.75 is: 1,493.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.38 : 692.75 = 692.75 : x
  2. Step 2: Convert to fraction form
    321.38/692.75 = 692.75/x
  3. Step 3: Cross multiply
    321.38x = 692.75 × 692.75
  4. Step 4: Simplify right side
    321.38x = 479,902.56
  5. Step 5: Solve for x
    x = 479,902.56/321.38
  6. Step 6: Final answer
    x = 1,493.28

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.