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Finding the Third Proportional to 640.97 and 982.69

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Solution

The third proportional to 640.97 and 982.69 is: 1,506.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.97 : 982.69 = 982.69 : x
  2. Step 2: Convert to fraction form
    640.97/982.69 = 982.69/x
  3. Step 3: Cross multiply
    640.97x = 982.69 × 982.69
  4. Step 4: Simplify right side
    640.97x = 965,674.72
  5. Step 5: Solve for x
    x = 965,674.72/640.97
  6. Step 6: Final answer
    x = 1,506.59

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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.