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Finding the Third Proportional to 422.50 and 645.25

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Solution

The third proportional to 422.50 and 645.25 is: 985.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.50 : 645.25 = 645.25 : x
  2. Step 2: Convert to fraction form
    422.50/645.25 = 645.25/x
  3. Step 3: Cross multiply
    422.50x = 645.25 × 645.25
  4. Step 4: Simplify right side
    422.50x = 416,347.56
  5. Step 5: Solve for x
    x = 416,347.56/422.50
  6. Step 6: Final answer
    x = 985.44

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.