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Finding the Third Proportional to 641 and 765

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Solution

The third proportional to 641 and 765 is: 912.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    641 : 765 = 765 : x
  2. Step 2: Convert to fraction form
    641/765 = 765/x
  3. Step 3: Cross multiply
    641x = 765 × 765
  4. Step 4: Simplify right side
    641x = 585,225
  5. Step 5: Solve for x
    x = 585,225/641
  6. Step 6: Final answer
    x = 912.99

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Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.