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Finding the Third Proportional to 1,689 and 2,578.50

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Solution

The third proportional to 1,689 and 2,578.50 is: 3,936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689 : 2,578.50 = 2,578.50 : x
  2. Step 2: Convert to fraction form
    1,689/2,578.50 = 2,578.50/x
  3. Step 3: Cross multiply
    1,689x = 2,578.50 × 2,578.50
  4. Step 4: Simplify right side
    1,689x = 6,648,662.25
  5. Step 5: Solve for x
    x = 6,648,662.25/1,689
  6. Step 6: Final answer
    x = 3,936.45

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.