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Finding the Third Proportional to 643 and 907

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Solution

The third proportional to 643 and 907 is: 1,279.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    643 : 907 = 907 : x
  2. Step 2: Convert to fraction form
    643/907 = 907/x
  3. Step 3: Cross multiply
    643x = 907 × 907
  4. Step 4: Simplify right side
    643x = 822,649
  5. Step 5: Solve for x
    x = 822,649/643
  6. Step 6: Final answer
    x = 1,279.39

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.