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Finding the Fourth Proportional to 394.48, 591.75 and 120.55

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Solution

The fourth proportional to 394.48, 591.75 and 120.55 is: 180.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.48 : 591.75 = 120.55 : x
  2. Step 2: Convert to fraction form
    394.48/591.75 = 120.55/x
  3. Step 3: Cross multiply
    394.48x = 591.75 × 120.55
  4. Step 4: Simplify right side
    394.48x = 71,335.16
  5. Step 5: Solve for x
    x = 71,335.16/394.48
  6. Step 6: Final answer
    x = 180.83

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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.