Home / 2,231.28-3,078.78-1,286.85

Finding the Fourth Proportional to 2,231.28, 3,078.78 and 1,286.85

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Solution

The fourth proportional to 2,231.28, 3,078.78 and 1,286.85 is: 1,775.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,231.28 : 3,078.78 = 1,286.85 : x
  2. Step 2: Convert to fraction form
    2,231.28/3,078.78 = 1,286.85/x
  3. Step 3: Cross multiply
    2,231.28x = 3,078.78 × 1,286.85
  4. Step 4: Simplify right side
    2,231.28x = 3,961,928.04
  5. Step 5: Solve for x
    x = 3,961,928.04/2,231.28
  6. Step 6: Final answer
    x = 1,775.63

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1.5x scale

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.