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Finding the Fourth Proportional to 286.14, 394.86 and 169.72

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Solution

The fourth proportional to 286.14, 394.86 and 169.72 is: 234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.14 : 394.86 = 169.72 : x
  2. Step 2: Convert to fraction form
    286.14/394.86 = 169.72/x
  3. Step 3: Cross multiply
    286.14x = 394.86 × 169.72
  4. Step 4: Simplify right side
    286.14x = 67,015.64
  5. Step 5: Solve for x
    x = 67,015.64/286.14
  6. Step 6: Final answer
    x = 234.21

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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.