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Finding the Fourth Proportional to 1,190.78, 1,786.08 and 369.26

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Solution

The fourth proportional to 1,190.78, 1,786.08 and 369.26 is: 553.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.78 : 1,786.08 = 369.26 : x
  2. Step 2: Convert to fraction form
    1,190.78/1,786.08 = 369.26/x
  3. Step 3: Cross multiply
    1,190.78x = 1,786.08 × 369.26
  4. Step 4: Simplify right side
    1,190.78x = 659,527.90
  5. Step 5: Solve for x
    x = 659,527.90/1,190.78
  6. Step 6: Final answer
    x = 553.86

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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.