Home / 3,878.15-5,351.79-2,109.71

Finding the Fourth Proportional to 3,878.15, 5,351.79 and 2,109.71

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Solution

The fourth proportional to 3,878.15, 5,351.79 and 2,109.71 is: 2,911.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.15 : 5,351.79 = 2,109.71 : x
  2. Step 2: Convert to fraction form
    3,878.15/5,351.79 = 2,109.71/x
  3. Step 3: Cross multiply
    3,878.15x = 5,351.79 × 2,109.71
  4. Step 4: Simplify right side
    3,878.15x = 11,290,724.88
  5. Step 5: Solve for x
    x = 11,290,724.88/3,878.15
  6. Step 6: Final answer
    x = 2,911.37

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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.