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Finding the Third Proportional to 891 and 1,208.25

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Solution

The third proportional to 891 and 1,208.25 is: 1,638.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 1,208.25 = 1,208.25 : x
  2. Step 2: Convert to fraction form
    891/1,208.25 = 1,208.25/x
  3. Step 3: Cross multiply
    891x = 1,208.25 × 1,208.25
  4. Step 4: Simplify right side
    891x = 1,459,868.06
  5. Step 5: Solve for x
    x = 1,459,868.06/891
  6. Step 6: Final answer
    x = 1,638.46

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.