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Finding the Fourth Proportional to 1,991.57, 2,745.94 and 1,721.90

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Solution

The fourth proportional to 1,991.57, 2,745.94 and 1,721.90 is: 2,374.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.57 : 2,745.94 = 1,721.90 : x
  2. Step 2: Convert to fraction form
    1,991.57/2,745.94 = 1,721.90/x
  3. Step 3: Cross multiply
    1,991.57x = 2,745.94 × 1,721.90
  4. Step 4: Simplify right side
    1,991.57x = 4,728,234.09
  5. Step 5: Solve for x
    x = 4,728,234.09/1,991.57
  6. Step 6: Final answer
    x = 2,374.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.