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Finding the Third Proportional to 839.11 and 1,085.91

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Solution

The third proportional to 839.11 and 1,085.91 is: 1,405.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.11 : 1,085.91 = 1,085.91 : x
  2. Step 2: Convert to fraction form
    839.11/1,085.91 = 1,085.91/x
  3. Step 3: Cross multiply
    839.11x = 1,085.91 × 1,085.91
  4. Step 4: Simplify right side
    839.11x = 1,179,192.38
  5. Step 5: Solve for x
    x = 1,179,192.38/839.11
  6. Step 6: Final answer
    x = 1,405.29

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.