Home / 2,121.88-2,928.46-1,190.38

Finding the Fourth Proportional to 2,121.88, 2,928.46 and 1,190.38

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Solution

The fourth proportional to 2,121.88, 2,928.46 and 1,190.38 is: 1,642.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.88 : 2,928.46 = 1,190.38 : x
  2. Step 2: Convert to fraction form
    2,121.88/2,928.46 = 1,190.38/x
  3. Step 3: Cross multiply
    2,121.88x = 2,928.46 × 1,190.38
  4. Step 4: Simplify right side
    2,121.88x = 3,485,965.57
  5. Step 5: Solve for x
    x = 3,485,965.57/2,121.88
  6. Step 6: Final answer
    x = 1,642.87

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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.