Home / 3,879.88-5,354.30-2,111.49

Finding the Fourth Proportional to 3,879.88, 5,354.30 and 2,111.49

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Solution

The fourth proportional to 3,879.88, 5,354.30 and 2,111.49 is: 2,913.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.88 : 5,354.30 = 2,111.49 : x
  2. Step 2: Convert to fraction form
    3,879.88/5,354.30 = 2,111.49/x
  3. Step 3: Cross multiply
    3,879.88x = 5,354.30 × 2,111.49
  4. Step 4: Simplify right side
    3,879.88x = 11,305,556.19
  5. Step 5: Solve for x
    x = 11,305,556.19/3,879.88
  6. Step 6: Final answer
    x = 2,913.90

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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.