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Finding the Fourth Proportional to 286.21, 394.84 and 168.15

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Solution

The fourth proportional to 286.21, 394.84 and 168.15 is: 231.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.21 : 394.84 = 168.15 : x
  2. Step 2: Convert to fraction form
    286.21/394.84 = 168.15/x
  3. Step 3: Cross multiply
    286.21x = 394.84 × 168.15
  4. Step 4: Simplify right side
    286.21x = 66,391.36
  5. Step 5: Solve for x
    x = 66,391.36/286.21
  6. Step 6: Final answer
    x = 231.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.