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Finding the Third Proportional to 1,991.81 and 4,376.81

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Solution

The third proportional to 1,991.81 and 4,376.81 is: 9,617.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.81 : 4,376.81 = 4,376.81 : x
  2. Step 2: Convert to fraction form
    1,991.81/4,376.81 = 4,376.81/x
  3. Step 3: Cross multiply
    1,991.81x = 4,376.81 × 4,376.81
  4. Step 4: Simplify right side
    1,991.81x = 19,156,487.66
  5. Step 5: Solve for x
    x = 19,156,487.66/1,991.81
  6. Step 6: Final answer
    x = 9,617.62

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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.