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Finding the Third Proportional to 891 and 1,391.25

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Solution

The third proportional to 891 and 1,391.25 is: 2,172.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 1,391.25 = 1,391.25 : x
  2. Step 2: Convert to fraction form
    891/1,391.25 = 1,391.25/x
  3. Step 3: Cross multiply
    891x = 1,391.25 × 1,391.25
  4. Step 4: Simplify right side
    891x = 1,935,576.56
  5. Step 5: Solve for x
    x = 1,935,576.56/891
  6. Step 6: Final answer
    x = 2,172.36

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.