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Finding the Third Proportional to 1,161 and 1,269.84

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Solution

The third proportional to 1,161 and 1,269.84 is: 1,388.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161 : 1,269.84 = 1,269.84 : x
  2. Step 2: Convert to fraction form
    1,161/1,269.84 = 1,269.84/x
  3. Step 3: Cross multiply
    1,161x = 1,269.84 × 1,269.84
  4. Step 4: Simplify right side
    1,161x = 1,612,503.15
  5. Step 5: Solve for x
    x = 1,612,503.15/1,161
  6. Step 6: Final answer
    x = 1,388.89

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.