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Finding the Fourth Proportional to 286.15, 394.89 and 161.80

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Solution

The fourth proportional to 286.15, 394.89 and 161.80 is: 223.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.15 : 394.89 = 161.80 : x
  2. Step 2: Convert to fraction form
    286.15/394.89 = 161.80/x
  3. Step 3: Cross multiply
    286.15x = 394.89 × 161.80
  4. Step 4: Simplify right side
    286.15x = 63,891.84
  5. Step 5: Solve for x
    x = 63,891.84/286.15
  6. Step 6: Final answer
    x = 223.28

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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.