Home / 3,921.52-5,406.78-2,871.76

Finding the Fourth Proportional to 3,921.52, 5,406.78 and 2,871.76

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Solution

The fourth proportional to 3,921.52, 5,406.78 and 2,871.76 is: 3,959.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.52 : 5,406.78 = 2,871.76 : x
  2. Step 2: Convert to fraction form
    3,921.52/5,406.78 = 2,871.76/x
  3. Step 3: Cross multiply
    3,921.52x = 5,406.78 × 2,871.76
  4. Step 4: Simplify right side
    3,921.52x = 15,526,974.53
  5. Step 5: Solve for x
    x = 15,526,974.53/3,921.52
  6. Step 6: Final answer
    x = 3,959.43

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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.