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Finding the Fourth Proportional to 3,381.70, 5,072.56 and 1,189.92

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Solution

The fourth proportional to 3,381.70, 5,072.56 and 1,189.92 is: 1,784.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,381.70 : 5,072.56 = 1,189.92 : x
  2. Step 2: Convert to fraction form
    3,381.70/5,072.56 = 1,189.92/x
  3. Step 3: Cross multiply
    3,381.70x = 5,072.56 × 1,189.92
  4. Step 4: Simplify right side
    3,381.70x = 6,035,940.60
  5. Step 5: Solve for x
    x = 6,035,940.60/3,381.70
  6. Step 6: Final answer
    x = 1,784.88

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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.