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Finding the Third Proportional to 641.63 and 908.63

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Solution

The third proportional to 641.63 and 908.63 is: 1,286.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.63 : 908.63 = 908.63 : x
  2. Step 2: Convert to fraction form
    641.63/908.63 = 908.63/x
  3. Step 3: Cross multiply
    641.63x = 908.63 × 908.63
  4. Step 4: Simplify right side
    641.63x = 825,599.39
  5. Step 5: Solve for x
    x = 825,599.39/641.63
  6. Step 6: Final answer
    x = 1,286.73

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.