Home / 3,921.33-5,411.44-2,128.81

Finding the Fourth Proportional to 3,921.33, 5,411.44 and 2,128.81

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Solution

The fourth proportional to 3,921.33, 5,411.44 and 2,128.81 is: 2,937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.33 : 5,411.44 = 2,128.81 : x
  2. Step 2: Convert to fraction form
    3,921.33/5,411.44 = 2,128.81/x
  3. Step 3: Cross multiply
    3,921.33x = 5,411.44 × 2,128.81
  4. Step 4: Simplify right side
    3,921.33x = 11,519,922.71
  5. Step 5: Solve for x
    x = 11,519,922.71/3,921.33
  6. Step 6: Final answer
    x = 2,937.76

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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.