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Finding the Third Proportional to 811 and 1,242

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Solution

The third proportional to 811 and 1,242 is: 1,902.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    811 : 1,242 = 1,242 : x
  2. Step 2: Convert to fraction form
    811/1,242 = 1,242/x
  3. Step 3: Cross multiply
    811x = 1,242 × 1,242
  4. Step 4: Simplify right side
    811x = 1,542,564
  5. Step 5: Solve for x
    x = 1,542,564/811
  6. Step 6: Final answer
    x = 1,902.05

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.