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Finding the Third Proportional to 643.75 and 1,041

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Solution

The third proportional to 643.75 and 1,041 is: 1,683.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.75 : 1,041 = 1,041 : x
  2. Step 2: Convert to fraction form
    643.75/1,041 = 1,041/x
  3. Step 3: Cross multiply
    643.75x = 1,041 × 1,041
  4. Step 4: Simplify right side
    643.75x = 1,083,681
  5. Step 5: Solve for x
    x = 1,083,681/643.75
  6. Step 6: Final answer
    x = 1,683.39

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.