Home / 5,129.88-7,078.86-2,891.64

Finding the Fourth Proportional to 5,129.88, 7,078.86 and 2,891.64

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Solution

The fourth proportional to 5,129.88, 7,078.86 and 2,891.64 is: 3,990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.88 : 7,078.86 = 2,891.64 : x
  2. Step 2: Convert to fraction form
    5,129.88/7,078.86 = 2,891.64/x
  3. Step 3: Cross multiply
    5,129.88x = 7,078.86 × 2,891.64
  4. Step 4: Simplify right side
    5,129.88x = 20,469,514.73
  5. Step 5: Solve for x
    x = 20,469,514.73/5,129.88
  6. Step 6: Final answer
    x = 3,990.25

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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.