Home / 2,187.20-3,018.32-1,255.70

Finding the Fourth Proportional to 2,187.20, 3,018.32 and 1,255.70

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Solution

The fourth proportional to 2,187.20, 3,018.32 and 1,255.70 is: 1,732.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.20 : 3,018.32 = 1,255.70 : x
  2. Step 2: Convert to fraction form
    2,187.20/3,018.32 = 1,255.70/x
  3. Step 3: Cross multiply
    2,187.20x = 3,018.32 × 1,255.70
  4. Step 4: Simplify right side
    2,187.20x = 3,790,104.42
  5. Step 5: Solve for x
    x = 3,790,104.42/2,187.20
  6. Step 6: Final answer
    x = 1,732.86

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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.