Home / 3,879.78-5,354.01-2,111.42

Finding the Fourth Proportional to 3,879.78, 5,354.01 and 2,111.42

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Solution

The fourth proportional to 3,879.78, 5,354.01 and 2,111.42 is: 2,913.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.78 : 5,354.01 = 2,111.42 : x
  2. Step 2: Convert to fraction form
    3,879.78/5,354.01 = 2,111.42/x
  3. Step 3: Cross multiply
    3,879.78x = 5,354.01 × 2,111.42
  4. Step 4: Simplify right side
    3,879.78x = 11,304,537.02
  5. Step 5: Solve for x
    x = 11,304,537.02/3,879.78
  6. Step 6: Final answer
    x = 2,913.71

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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.