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Finding the Fourth Proportional to 133.80, 199.65 and 120.18

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Solution

The fourth proportional to 133.80, 199.65 and 120.18 is: 179.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.80 : 199.65 = 120.18 : x
  2. Step 2: Convert to fraction form
    133.80/199.65 = 120.18/x
  3. Step 3: Cross multiply
    133.80x = 199.65 × 120.18
  4. Step 4: Simplify right side
    133.80x = 23,993.94
  5. Step 5: Solve for x
    x = 23,993.94/133.80
  6. Step 6: Final answer
    x = 179.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.