Home / 3,947.78-5,447.76-2,179.35

Finding the Fourth Proportional to 3,947.78, 5,447.76 and 2,179.35

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Solution

The fourth proportional to 3,947.78, 5,447.76 and 2,179.35 is: 3,007.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.78 : 5,447.76 = 2,179.35 : x
  2. Step 2: Convert to fraction form
    3,947.78/5,447.76 = 2,179.35/x
  3. Step 3: Cross multiply
    3,947.78x = 5,447.76 × 2,179.35
  4. Step 4: Simplify right side
    3,947.78x = 11,872,575.76
  5. Step 5: Solve for x
    x = 11,872,575.76/3,947.78
  6. Step 6: Final answer
    x = 3,007.41

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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.