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Finding the Third Proportional to 1,689 and 2,313.38

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Solution

The third proportional to 1,689 and 2,313.38 is: 3,168.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689 : 2,313.38 = 2,313.38 : x
  2. Step 2: Convert to fraction form
    1,689/2,313.38 = 2,313.38/x
  3. Step 3: Cross multiply
    1,689x = 2,313.38 × 2,313.38
  4. Step 4: Simplify right side
    1,689x = 5,351,703.89
  5. Step 5: Solve for x
    x = 5,351,703.89/1,689
  6. Step 6: Final answer
    x = 3,168.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.