Home / 1,991.20-2,747.76-1,151.76

Finding the Fourth Proportional to 1,991.20, 2,747.76 and 1,151.76

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Solution

The fourth proportional to 1,991.20, 2,747.76 and 1,151.76 is: 1,589.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.20 : 2,747.76 = 1,151.76 : x
  2. Step 2: Convert to fraction form
    1,991.20/2,747.76 = 1,151.76/x
  3. Step 3: Cross multiply
    1,991.20x = 2,747.76 × 1,151.76
  4. Step 4: Simplify right side
    1,991.20x = 3,164,760.06
  5. Step 5: Solve for x
    x = 3,164,760.06/1,991.20
  6. Step 6: Final answer
    x = 1,589.37

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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.