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Finding the Fourth Proportional to 286.64, 394.36 and 221.03

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Solution

The fourth proportional to 286.64, 394.36 and 221.03 is: 304.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.64 : 394.36 = 221.03 : x
  2. Step 2: Convert to fraction form
    286.64/394.36 = 221.03/x
  3. Step 3: Cross multiply
    286.64x = 394.36 × 221.03
  4. Step 4: Simplify right side
    286.64x = 87,162.87
  5. Step 5: Solve for x
    x = 87,162.87/286.64
  6. Step 6: Final answer
    x = 304.09

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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.