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Finding the Fourth Proportional to 394.57, 591.86 and 120.69

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Solution

The fourth proportional to 394.57, 591.86 and 120.69 is: 181.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.57 : 591.86 = 120.69 : x
  2. Step 2: Convert to fraction form
    394.57/591.86 = 120.69/x
  3. Step 3: Cross multiply
    394.57x = 591.86 × 120.69
  4. Step 4: Simplify right side
    394.57x = 71,431.21
  5. Step 5: Solve for x
    x = 71,431.21/394.57
  6. Step 6: Final answer
    x = 181.04

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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.