Home / 3,989.88-5,505.80-2,311.18

Finding the Fourth Proportional to 3,989.88, 5,505.80 and 2,311.18

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Solution

The fourth proportional to 3,989.88, 5,505.80 and 2,311.18 is: 3,189.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.88 : 5,505.80 = 2,311.18 : x
  2. Step 2: Convert to fraction form
    3,989.88/5,505.80 = 2,311.18/x
  3. Step 3: Cross multiply
    3,989.88x = 5,505.80 × 2,311.18
  4. Step 4: Simplify right side
    3,989.88x = 12,724,869.52
  5. Step 5: Solve for x
    x = 12,724,869.52/3,989.88
  6. Step 6: Final answer
    x = 3,189.29

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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.