Home / 1,428.80-2,143.20-1,198.40

Finding the Fourth Proportional to 1,428.80, 2,143.20 and 1,198.40

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Solution

The fourth proportional to 1,428.80, 2,143.20 and 1,198.40 is: 1,797.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.80 : 2,143.20 = 1,198.40 : x
  2. Step 2: Convert to fraction form
    1,428.80/2,143.20 = 1,198.40/x
  3. Step 3: Cross multiply
    1,428.80x = 2,143.20 × 1,198.40
  4. Step 4: Simplify right side
    1,428.80x = 2,568,410.88
  5. Step 5: Solve for x
    x = 2,568,410.88/1,428.80
  6. Step 6: Final answer
    x = 1,797.60

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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.