Home / 2,129.87-2,939.20-1,198.37

Finding the Fourth Proportional to 2,129.87, 2,939.20 and 1,198.37

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Solution

The fourth proportional to 2,129.87, 2,939.20 and 1,198.37 is: 1,653.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.87 : 2,939.20 = 1,198.37 : x
  2. Step 2: Convert to fraction form
    2,129.87/2,939.20 = 1,198.37/x
  3. Step 3: Cross multiply
    2,129.87x = 2,939.20 × 1,198.37
  4. Step 4: Simplify right side
    2,129.87x = 3,522,249.10
  5. Step 5: Solve for x
    x = 3,522,249.10/2,129.87
  6. Step 6: Final answer
    x = 1,653.74

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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.