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Finding the Fourth Proportional to 190.22, 285.09 and 81.86

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Solution

The fourth proportional to 190.22, 285.09 and 81.86 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.22 : 285.09 = 81.86 : x
  2. Step 2: Convert to fraction form
    190.22/285.09 = 81.86/x
  3. Step 3: Cross multiply
    190.22x = 285.09 × 81.86
  4. Step 4: Simplify right side
    190.22x = 23,337.47
  5. Step 5: Solve for x
    x = 23,337.47/190.22
  6. Step 6: Final answer
    x = 122.69

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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.