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Finding the Fourth Proportional to 190.81, 286.05 and 75.22

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Solution

The fourth proportional to 190.81, 286.05 and 75.22 is: 112.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.81 : 286.05 = 75.22 : x
  2. Step 2: Convert to fraction form
    190.81/286.05 = 75.22/x
  3. Step 3: Cross multiply
    190.81x = 286.05 × 75.22
  4. Step 4: Simplify right side
    190.81x = 21,516.68
  5. Step 5: Solve for x
    x = 21,516.68/190.81
  6. Step 6: Final answer
    x = 112.76

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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.