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Finding the Fourth Proportional to 1,991.27, 2,747.82 and 1,245.19

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Solution

The fourth proportional to 1,991.27, 2,747.82 and 1,245.19 is: 1,718.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.27 : 2,747.82 = 1,245.19 : x
  2. Step 2: Convert to fraction form
    1,991.27/2,747.82 = 1,245.19/x
  3. Step 3: Cross multiply
    1,991.27x = 2,747.82 × 1,245.19
  4. Step 4: Simplify right side
    1,991.27x = 3,421,557.99
  5. Step 5: Solve for x
    x = 3,421,557.99/1,991.27
  6. Step 6: Final answer
    x = 1,718.28

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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.