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Finding the Third Proportional to 1,116.75 and 1,989.25

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Solution

The third proportional to 1,116.75 and 1,989.25 is: 3,543.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.75 : 1,989.25 = 1,989.25 : x
  2. Step 2: Convert to fraction form
    1,116.75/1,989.25 = 1,989.25/x
  3. Step 3: Cross multiply
    1,116.75x = 1,989.25 × 1,989.25
  4. Step 4: Simplify right side
    1,116.75x = 3,957,115.56
  5. Step 5: Solve for x
    x = 3,957,115.56/1,116.75
  6. Step 6: Final answer
    x = 3,543.42

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.