Home / 3,938.31-5,911.11-1,991.88

Finding the Fourth Proportional to 3,938.31, 5,911.11 and 1,991.88

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Solution

The fourth proportional to 3,938.31, 5,911.11 and 1,991.88 is: 2,989.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.31 : 5,911.11 = 1,991.88 : x
  2. Step 2: Convert to fraction form
    3,938.31/5,911.11 = 1,991.88/x
  3. Step 3: Cross multiply
    3,938.31x = 5,911.11 × 1,991.88
  4. Step 4: Simplify right side
    3,938.31x = 11,774,221.79
  5. Step 5: Solve for x
    x = 11,774,221.79/3,938.31
  6. Step 6: Final answer
    x = 2,989.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.