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Finding the Fourth Proportional to 286.72, 395.34 and 221.08

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Solution

The fourth proportional to 286.72, 395.34 and 221.08 is: 304.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.72 : 395.34 = 221.08 : x
  2. Step 2: Convert to fraction form
    286.72/395.34 = 221.08/x
  3. Step 3: Cross multiply
    286.72x = 395.34 × 221.08
  4. Step 4: Simplify right side
    286.72x = 87,401.77
  5. Step 5: Solve for x
    x = 87,401.77/286.72
  6. Step 6: Final answer
    x = 304.83

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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.