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Finding the Fourth Proportional to 190.90, 286.44 and 109.81

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Solution

The fourth proportional to 190.90, 286.44 and 109.81 is: 164.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.90 : 286.44 = 109.81 : x
  2. Step 2: Convert to fraction form
    190.90/286.44 = 109.81/x
  3. Step 3: Cross multiply
    190.90x = 286.44 × 109.81
  4. Step 4: Simplify right side
    190.90x = 31,453.98
  5. Step 5: Solve for x
    x = 31,453.98/190.90
  6. Step 6: Final answer
    x = 164.77

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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.