Home / 1,991.20-2,748.10-1,151.88

Finding the Fourth Proportional to 1,991.20, 2,748.10 and 1,151.88

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Solution

The fourth proportional to 1,991.20, 2,748.10 and 1,151.88 is: 1,589.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.20 : 2,748.10 = 1,151.88 : x
  2. Step 2: Convert to fraction form
    1,991.20/2,748.10 = 1,151.88/x
  3. Step 3: Cross multiply
    1,991.20x = 2,748.10 × 1,151.88
  4. Step 4: Simplify right side
    1,991.20x = 3,165,475.57
  5. Step 5: Solve for x
    x = 3,165,475.57/1,991.20
  6. Step 6: Final answer
    x = 1,589.74

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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.