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Finding the Third Proportional to 361.69 and 643.22

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Solution

The third proportional to 361.69 and 643.22 is: 1,143.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.69 : 643.22 = 643.22 : x
  2. Step 2: Convert to fraction form
    361.69/643.22 = 643.22/x
  3. Step 3: Cross multiply
    361.69x = 643.22 × 643.22
  4. Step 4: Simplify right side
    361.69x = 413,730.36
  5. Step 5: Solve for x
    x = 413,730.36/361.69
  6. Step 6: Final answer
    x = 1,143.89

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.