Home / 2,128.78-3,195.26-1,398.88

Finding the Fourth Proportional to 2,128.78, 3,195.26 and 1,398.88

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Solution

The fourth proportional to 2,128.78, 3,195.26 and 1,398.88 is: 2,099.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.78 : 3,195.26 = 1,398.88 : x
  2. Step 2: Convert to fraction form
    2,128.78/3,195.26 = 1,398.88/x
  3. Step 3: Cross multiply
    2,128.78x = 3,195.26 × 1,398.88
  4. Step 4: Simplify right side
    2,128.78x = 4,469,785.31
  5. Step 5: Solve for x
    x = 4,469,785.31/2,128.78
  6. Step 6: Final answer
    x = 2,099.69

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1.5x scale

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.