Home / 3,879.70-5,354.01-2,111.31

Finding the Fourth Proportional to 3,879.70, 5,354.01 and 2,111.31

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Solution

The fourth proportional to 3,879.70, 5,354.01 and 2,111.31 is: 2,913.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.70 : 5,354.01 = 2,111.31 : x
  2. Step 2: Convert to fraction form
    3,879.70/5,354.01 = 2,111.31/x
  3. Step 3: Cross multiply
    3,879.70x = 5,354.01 × 2,111.31
  4. Step 4: Simplify right side
    3,879.70x = 11,303,964.30
  5. Step 5: Solve for x
    x = 11,303,964.30/3,879.70
  6. Step 6: Final answer
    x = 2,913.62

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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.