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Finding the Third Proportional to 447.75 and 640.69

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Solution

The third proportional to 447.75 and 640.69 is: 916.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.75 : 640.69 = 640.69 : x
  2. Step 2: Convert to fraction form
    447.75/640.69 = 640.69/x
  3. Step 3: Cross multiply
    447.75x = 640.69 × 640.69
  4. Step 4: Simplify right side
    447.75x = 410,480.47
  5. Step 5: Solve for x
    x = 410,480.47/447.75
  6. Step 6: Final answer
    x = 916.76

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.