Home / 3,881.21-5,356.11-2,112.81

Finding the Fourth Proportional to 3,881.21, 5,356.11 and 2,112.81

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Solution

The fourth proportional to 3,881.21, 5,356.11 and 2,112.81 is: 2,915.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,881.21 : 5,356.11 = 2,112.81 : x
  2. Step 2: Convert to fraction form
    3,881.21/5,356.11 = 2,112.81/x
  3. Step 3: Cross multiply
    3,881.21x = 5,356.11 × 2,112.81
  4. Step 4: Simplify right side
    3,881.21x = 11,316,442.77
  5. Step 5: Solve for x
    x = 11,316,442.77/3,881.21
  6. Step 6: Final answer
    x = 2,915.70

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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.