Home / 3,879.57-5,353.83-2,111.20

Finding the Fourth Proportional to 3,879.57, 5,353.83 and 2,111.20

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Solution

The fourth proportional to 3,879.57, 5,353.83 and 2,111.20 is: 2,913.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.57 : 5,353.83 = 2,111.20 : x
  2. Step 2: Convert to fraction form
    3,879.57/5,353.83 = 2,111.20/x
  3. Step 3: Cross multiply
    3,879.57x = 5,353.83 × 2,111.20
  4. Step 4: Simplify right side
    3,879.57x = 11,302,992.51
  5. Step 5: Solve for x
    x = 11,302,992.51/3,879.57
  6. Step 6: Final answer
    x = 2,913.46

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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.