Home / 2,815.68-4,222.92-1,991.64

Finding the Fourth Proportional to 2,815.68, 4,222.92 and 1,991.64

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Solution

The fourth proportional to 2,815.68, 4,222.92 and 1,991.64 is: 2,987.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.68 : 4,222.92 = 1,991.64 : x
  2. Step 2: Convert to fraction form
    2,815.68/4,222.92 = 1,991.64/x
  3. Step 3: Cross multiply
    2,815.68x = 4,222.92 × 1,991.64
  4. Step 4: Simplify right side
    2,815.68x = 8,410,536.39
  5. Step 5: Solve for x
    x = 8,410,536.39/2,815.68
  6. Step 6: Final answer
    x = 2,987.04

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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.