Home / 3,879.50-5,353.80-2,111.12

Finding the Fourth Proportional to 3,879.50, 5,353.80 and 2,111.12

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Solution

The fourth proportional to 3,879.50, 5,353.80 and 2,111.12 is: 2,913.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.50 : 5,353.80 = 2,111.12 : x
  2. Step 2: Convert to fraction form
    3,879.50/5,353.80 = 2,111.12/x
  3. Step 3: Cross multiply
    3,879.50x = 5,353.80 × 2,111.12
  4. Step 4: Simplify right side
    3,879.50x = 11,302,514.26
  5. Step 5: Solve for x
    x = 11,302,514.26/3,879.50
  6. Step 6: Final answer
    x = 2,913.39

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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.