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Finding the Fourth Proportional to 394.19, 591.34 and 120.25

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Solution

The fourth proportional to 394.19, 591.34 and 120.25 is: 180.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.19 : 591.34 = 120.25 : x
  2. Step 2: Convert to fraction form
    394.19/591.34 = 120.25/x
  3. Step 3: Cross multiply
    394.19x = 591.34 × 120.25
  4. Step 4: Simplify right side
    394.19x = 71,108.64
  5. Step 5: Solve for x
    x = 71,108.64/394.19
  6. Step 6: Final answer
    x = 180.39

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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.