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Finding the Third Proportional to 905 and 1,679

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Solution

The third proportional to 905 and 1,679 is: 3,114.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    905 : 1,679 = 1,679 : x
  2. Step 2: Convert to fraction form
    905/1,679 = 1,679/x
  3. Step 3: Cross multiply
    905x = 1,679 × 1,679
  4. Step 4: Simplify right side
    905x = 2,819,041
  5. Step 5: Solve for x
    x = 2,819,041/905
  6. Step 6: Final answer
    x = 3,114.96

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.