Home / 2,120.40-3,179.49-1,243.10

Finding the Fourth Proportional to 2,120.40, 3,179.49 and 1,243.10

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Solution

The fourth proportional to 2,120.40, 3,179.49 and 1,243.10 is: 1,863.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.40 : 3,179.49 = 1,243.10 : x
  2. Step 2: Convert to fraction form
    2,120.40/3,179.49 = 1,243.10/x
  3. Step 3: Cross multiply
    2,120.40x = 3,179.49 × 1,243.10
  4. Step 4: Simplify right side
    2,120.40x = 3,952,408.12
  5. Step 5: Solve for x
    x = 3,952,408.12/2,120.40
  6. Step 6: Final answer
    x = 1,863.99

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1.5x scale

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.