Home / 3,115.38-4,297.49-1,978.95

Finding the Fourth Proportional to 3,115.38, 4,297.49 and 1,978.95

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Solution

The fourth proportional to 3,115.38, 4,297.49 and 1,978.95 is: 2,729.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.38 : 4,297.49 = 1,978.95 : x
  2. Step 2: Convert to fraction form
    3,115.38/4,297.49 = 1,978.95/x
  3. Step 3: Cross multiply
    3,115.38x = 4,297.49 × 1,978.95
  4. Step 4: Simplify right side
    3,115.38x = 8,504,507.94
  5. Step 5: Solve for x
    x = 8,504,507.94/3,115.38
  6. Step 6: Final answer
    x = 2,729.85

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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.