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Finding the Third Proportional to 309.66 and 667.41

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Solution

The third proportional to 309.66 and 667.41 is: 1,438.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.66 : 667.41 = 667.41 : x
  2. Step 2: Convert to fraction form
    309.66/667.41 = 667.41/x
  3. Step 3: Cross multiply
    309.66x = 667.41 × 667.41
  4. Step 4: Simplify right side
    309.66x = 445,431.10
  5. Step 5: Solve for x
    x = 445,431.10/309.66
  6. Step 6: Final answer
    x = 1,438.47

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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.