Home / 2,128.51-3,195.78-1,205.87

Finding the Fourth Proportional to 2,128.51, 3,195.78 and 1,205.87

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Solution

The fourth proportional to 2,128.51, 3,195.78 and 1,205.87 is: 1,810.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.51 : 3,195.78 = 1,205.87 : x
  2. Step 2: Convert to fraction form
    2,128.51/3,195.78 = 1,205.87/x
  3. Step 3: Cross multiply
    2,128.51x = 3,195.78 × 1,205.87
  4. Step 4: Simplify right side
    2,128.51x = 3,853,689.20
  5. Step 5: Solve for x
    x = 3,853,689.20/2,128.51
  6. Step 6: Final answer
    x = 1,810.51

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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.