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Finding the Third Proportional to 641.75 and 862.75

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Solution

The third proportional to 641.75 and 862.75 is: 1,159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.75 : 862.75 = 862.75 : x
  2. Step 2: Convert to fraction form
    641.75/862.75 = 862.75/x
  3. Step 3: Cross multiply
    641.75x = 862.75 × 862.75
  4. Step 4: Simplify right side
    641.75x = 744,337.56
  5. Step 5: Solve for x
    x = 744,337.56/641.75
  6. Step 6: Final answer
    x = 1,159.86

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.