Home / 2,128.70-3,186.21-1,139.05

Finding the Fourth Proportional to 2,128.70, 3,186.21 and 1,139.05

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Solution

The fourth proportional to 2,128.70, 3,186.21 and 1,139.05 is: 1,704.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.70 : 3,186.21 = 1,139.05 : x
  2. Step 2: Convert to fraction form
    2,128.70/3,186.21 = 1,139.05/x
  3. Step 3: Cross multiply
    2,128.70x = 3,186.21 × 1,139.05
  4. Step 4: Simplify right side
    2,128.70x = 3,629,252.50
  5. Step 5: Solve for x
    x = 3,629,252.50/2,128.70
  6. Step 6: Final answer
    x = 1,704.91

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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.