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Finding the Fourth Proportional to 3,786.40, 5,679.87 and 1,189.54

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Solution

The fourth proportional to 3,786.40, 5,679.87 and 1,189.54 is: 1,784.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,786.40 : 5,679.87 = 1,189.54 : x
  2. Step 2: Convert to fraction form
    3,786.40/5,679.87 = 1,189.54/x
  3. Step 3: Cross multiply
    3,786.40x = 5,679.87 × 1,189.54
  4. Step 4: Simplify right side
    3,786.40x = 6,756,432.56
  5. Step 5: Solve for x
    x = 6,756,432.56/3,786.40
  6. Step 6: Final answer
    x = 1,784.39

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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.