Home / 2,811.42-3,879.11-1,631.79

Finding the Fourth Proportional to 2,811.42, 3,879.11 and 1,631.79

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Solution

The fourth proportional to 2,811.42, 3,879.11 and 1,631.79 is: 2,251.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.42 : 3,879.11 = 1,631.79 : x
  2. Step 2: Convert to fraction form
    2,811.42/3,879.11 = 1,631.79/x
  3. Step 3: Cross multiply
    2,811.42x = 3,879.11 × 1,631.79
  4. Step 4: Simplify right side
    2,811.42x = 6,329,884.75
  5. Step 5: Solve for x
    x = 6,329,884.75/2,811.42
  6. Step 6: Final answer
    x = 2,251.49

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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.