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Finding the Fourth Proportional to 190.09, 285.21 and 80.44

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Solution

The fourth proportional to 190.09, 285.21 and 80.44 is: 120.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.09 : 285.21 = 80.44 : x
  2. Step 2: Convert to fraction form
    190.09/285.21 = 80.44/x
  3. Step 3: Cross multiply
    190.09x = 285.21 × 80.44
  4. Step 4: Simplify right side
    190.09x = 22,942.29
  5. Step 5: Solve for x
    x = 22,942.29/190.09
  6. Step 6: Final answer
    x = 120.69

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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.