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Finding the Fourth Proportional to 190.80, 285.84 and 109.39

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Solution

The fourth proportional to 190.80, 285.84 and 109.39 is: 163.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.80 : 285.84 = 109.39 : x
  2. Step 2: Convert to fraction form
    190.80/285.84 = 109.39/x
  3. Step 3: Cross multiply
    190.80x = 285.84 × 109.39
  4. Step 4: Simplify right side
    190.80x = 31,267.49
  5. Step 5: Solve for x
    x = 31,267.49/190.80
  6. Step 6: Final answer
    x = 163.88

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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.