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Finding the Fourth Proportional to 394.11, 591.18 and 120.23

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Solution

The fourth proportional to 394.11, 591.18 and 120.23 is: 180.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.11 : 591.18 = 120.23 : x
  2. Step 2: Convert to fraction form
    394.11/591.18 = 120.23/x
  3. Step 3: Cross multiply
    394.11x = 591.18 × 120.23
  4. Step 4: Simplify right side
    394.11x = 71,074.62
  5. Step 5: Solve for x
    x = 71,074.62/394.11
  6. Step 6: Final answer
    x = 180.34

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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.