Home / 2,745.78-3,789.51-2,115.80

Finding the Fourth Proportional to 2,745.78, 3,789.51 and 2,115.80

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Solution

The fourth proportional to 2,745.78, 3,789.51 and 2,115.80 is: 2,920.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,745.78 : 3,789.51 = 2,115.80 : x
  2. Step 2: Convert to fraction form
    2,745.78/3,789.51 = 2,115.80/x
  3. Step 3: Cross multiply
    2,745.78x = 3,789.51 × 2,115.80
  4. Step 4: Simplify right side
    2,745.78x = 8,017,826.31
  5. Step 5: Solve for x
    x = 8,017,826.31/2,745.78
  6. Step 6: Final answer
    x = 2,920.05

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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.