Home / 3,879.95-5,354.15-2,111.55

Finding the Fourth Proportional to 3,879.95, 5,354.15 and 2,111.55

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Solution

The fourth proportional to 3,879.95, 5,354.15 and 2,111.55 is: 2,913.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.95 : 5,354.15 = 2,111.55 : x
  2. Step 2: Convert to fraction form
    3,879.95/5,354.15 = 2,111.55/x
  3. Step 3: Cross multiply
    3,879.95x = 5,354.15 × 2,111.55
  4. Step 4: Simplify right side
    3,879.95x = 11,305,528.66
  5. Step 5: Solve for x
    x = 11,305,528.66/3,879.95
  6. Step 6: Final answer
    x = 2,913.84

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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.