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Finding the Fourth Proportional to 1,991.72, 2,747.20 and 1,163.72

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Solution

The fourth proportional to 1,991.72, 2,747.20 and 1,163.72 is: 1,605.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.72 : 2,747.20 = 1,163.72 : x
  2. Step 2: Convert to fraction form
    1,991.72/2,747.20 = 1,163.72/x
  3. Step 3: Cross multiply
    1,991.72x = 2,747.20 × 1,163.72
  4. Step 4: Simplify right side
    1,991.72x = 3,196,971.58
  5. Step 5: Solve for x
    x = 3,196,971.58/1,991.72
  6. Step 6: Final answer
    x = 1,605.13

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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.