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Finding the Fourth Proportional to 394.55, 591.94 and 120.64

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Solution

The fourth proportional to 394.55, 591.94 and 120.64 is: 180.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.55 : 591.94 = 120.64 : x
  2. Step 2: Convert to fraction form
    394.55/591.94 = 120.64/x
  3. Step 3: Cross multiply
    394.55x = 591.94 × 120.64
  4. Step 4: Simplify right side
    394.55x = 71,410.08
  5. Step 5: Solve for x
    x = 71,410.08/394.55
  6. Step 6: Final answer
    x = 180.99

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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.