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Finding the Third Proportional to 640.72 and 1,383.96

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Solution

The third proportional to 640.72 and 1,383.96 is: 2,989.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.72 : 1,383.96 = 1,383.96 : x
  2. Step 2: Convert to fraction form
    640.72/1,383.96 = 1,383.96/x
  3. Step 3: Cross multiply
    640.72x = 1,383.96 × 1,383.96
  4. Step 4: Simplify right side
    640.72x = 1,915,347.88
  5. Step 5: Solve for x
    x = 1,915,347.88/640.72
  6. Step 6: Final answer
    x = 2,989.36

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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.