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Finding the Fourth Proportional to 286.08, 394.79 and 155.09

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Solution

The fourth proportional to 286.08, 394.79 and 155.09 is: 214.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.08 : 394.79 = 155.09 : x
  2. Step 2: Convert to fraction form
    286.08/394.79 = 155.09/x
  3. Step 3: Cross multiply
    286.08x = 394.79 × 155.09
  4. Step 4: Simplify right side
    286.08x = 61,229.36
  5. Step 5: Solve for x
    x = 61,229.36/286.08
  6. Step 6: Final answer
    x = 214.03

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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.