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Finding the Third Proportional to 668.25 and 998.72

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Solution

The third proportional to 668.25 and 998.72 is: 1,492.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.25 : 998.72 = 998.72 : x
  2. Step 2: Convert to fraction form
    668.25/998.72 = 998.72/x
  3. Step 3: Cross multiply
    668.25x = 998.72 × 998.72
  4. Step 4: Simplify right side
    668.25x = 997,439.14
  5. Step 5: Solve for x
    x = 997,439.14/668.25
  6. Step 6: Final answer
    x = 1,492.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.