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Finding the Third Proportional to 406.69 and 668.81

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Solution

The third proportional to 406.69 and 668.81 is: 1,099.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.69 : 668.81 = 668.81 : x
  2. Step 2: Convert to fraction form
    406.69/668.81 = 668.81/x
  3. Step 3: Cross multiply
    406.69x = 668.81 × 668.81
  4. Step 4: Simplify right side
    406.69x = 447,310.16
  5. Step 5: Solve for x
    x = 447,310.16/406.69
  6. Step 6: Final answer
    x = 1,099.89

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.