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Finding the Third Proportional to 905.06 and 1,991.81

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Solution

The third proportional to 905.06 and 1,991.81 is: 4,383.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.06 : 1,991.81 = 1,991.81 : x
  2. Step 2: Convert to fraction form
    905.06/1,991.81 = 1,991.81/x
  3. Step 3: Cross multiply
    905.06x = 1,991.81 × 1,991.81
  4. Step 4: Simplify right side
    905.06x = 3,967,317.04
  5. Step 5: Solve for x
    x = 3,967,317.04/905.06
  6. Step 6: Final answer
    x = 4,383.47

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.