Home / 3,928.91-5,422.05-2,160.48

Finding the Fourth Proportional to 3,928.91, 5,422.05 and 2,160.48

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Solution

The fourth proportional to 3,928.91, 5,422.05 and 2,160.48 is: 2,981.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.91 : 5,422.05 = 2,160.48 : x
  2. Step 2: Convert to fraction form
    3,928.91/5,422.05 = 2,160.48/x
  3. Step 3: Cross multiply
    3,928.91x = 5,422.05 × 2,160.48
  4. Step 4: Simplify right side
    3,928.91x = 11,714,219.78
  5. Step 5: Solve for x
    x = 11,714,219.78/3,928.91
  6. Step 6: Final answer
    x = 2,981.54

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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.