Home / 3,081.78-4,622.58-1,991.88

Finding the Fourth Proportional to 3,081.78, 4,622.58 and 1,991.88

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Solution

The fourth proportional to 3,081.78, 4,622.58 and 1,991.88 is: 2,987.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,081.78 : 4,622.58 = 1,991.88 : x
  2. Step 2: Convert to fraction form
    3,081.78/4,622.58 = 1,991.88/x
  3. Step 3: Cross multiply
    3,081.78x = 4,622.58 × 1,991.88
  4. Step 4: Simplify right side
    3,081.78x = 9,207,624.65
  5. Step 5: Solve for x
    x = 9,207,624.65/3,081.78
  6. Step 6: Final answer
    x = 2,987.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.