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Finding the Fourth Proportional to 394.50, 591.74 and 120.57

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Solution

The fourth proportional to 394.50, 591.74 and 120.57 is: 180.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.50 : 591.74 = 120.57 : x
  2. Step 2: Convert to fraction form
    394.50/591.74 = 120.57/x
  3. Step 3: Cross multiply
    394.50x = 591.74 × 120.57
  4. Step 4: Simplify right side
    394.50x = 71,342.53
  5. Step 5: Solve for x
    x = 71,342.53/394.50
  6. Step 6: Final answer
    x = 180.85

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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.