Home / 3,881.28-5,356.22-2,112.88

Finding the Fourth Proportional to 3,881.28, 5,356.22 and 2,112.88

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Solution

The fourth proportional to 3,881.28, 5,356.22 and 2,112.88 is: 2,915.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,881.28 : 5,356.22 = 2,112.88 : x
  2. Step 2: Convert to fraction form
    3,881.28/5,356.22 = 2,112.88/x
  3. Step 3: Cross multiply
    3,881.28x = 5,356.22 × 2,112.88
  4. Step 4: Simplify right side
    3,881.28x = 11,317,039.55
  5. Step 5: Solve for x
    x = 11,317,039.55/3,881.28
  6. Step 6: Final answer
    x = 2,915.80

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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.