Home / 3,923.76-5,414.78-2,131.20

Finding the Fourth Proportional to 3,923.76, 5,414.78 and 2,131.20

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Solution

The fourth proportional to 3,923.76, 5,414.78 and 2,131.20 is: 2,941.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,923.76 : 5,414.78 = 2,131.20 : x
  2. Step 2: Convert to fraction form
    3,923.76/5,414.78 = 2,131.20/x
  3. Step 3: Cross multiply
    3,923.76x = 5,414.78 × 2,131.20
  4. Step 4: Simplify right side
    3,923.76x = 11,539,979.14
  5. Step 5: Solve for x
    x = 11,539,979.14/3,923.76
  6. Step 6: Final answer
    x = 2,941.05

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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.