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Finding the Third Proportional to 422 and 643.75

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Solution

The third proportional to 422 and 643.75 is: 982.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    422 : 643.75 = 643.75 : x
  2. Step 2: Convert to fraction form
    422/643.75 = 643.75/x
  3. Step 3: Cross multiply
    422x = 643.75 × 643.75
  4. Step 4: Simplify right side
    422x = 414,414.06
  5. Step 5: Solve for x
    x = 414,414.06/422
  6. Step 6: Final answer
    x = 982.02

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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.