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Finding the Third Proportional to 641.25 and 938.25

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Solution

The third proportional to 641.25 and 938.25 is: 1,372.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.25 : 938.25 = 938.25 : x
  2. Step 2: Convert to fraction form
    641.25/938.25 = 938.25/x
  3. Step 3: Cross multiply
    641.25x = 938.25 × 938.25
  4. Step 4: Simplify right side
    641.25x = 880,313.06
  5. Step 5: Solve for x
    x = 880,313.06/641.25
  6. Step 6: Final answer
    x = 1,372.81

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.