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Finding the Third Proportional to 891 and 2,121.75

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Solution

The third proportional to 891 and 2,121.75 is: 5,052.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 2,121.75 = 2,121.75 : x
  2. Step 2: Convert to fraction form
    891/2,121.75 = 2,121.75/x
  3. Step 3: Cross multiply
    891x = 2,121.75 × 2,121.75
  4. Step 4: Simplify right side
    891x = 4,501,823.06
  5. Step 5: Solve for x
    x = 4,501,823.06/891
  6. Step 6: Final answer
    x = 5,052.55

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.