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Finding the Third Proportional to 639.94 and 892.88

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Solution

The third proportional to 639.94 and 892.88 is: 1,245.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.94 : 892.88 = 892.88 : x
  2. Step 2: Convert to fraction form
    639.94/892.88 = 892.88/x
  3. Step 3: Cross multiply
    639.94x = 892.88 × 892.88
  4. Step 4: Simplify right side
    639.94x = 797,225.77
  5. Step 5: Solve for x
    x = 797,225.77/639.94
  6. Step 6: Final answer
    x = 1,245.79

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.