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Finding the Fourth Proportional to 378.44, 522.18 and 221

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Solution

The fourth proportional to 378.44, 522.18 and 221 is: 304.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.44 : 522.18 = 221 : x
  2. Step 2: Convert to fraction form
    378.44/522.18 = 221/x
  3. Step 3: Cross multiply
    378.44x = 522.18 × 221
  4. Step 4: Simplify right side
    378.44x = 115,401.78
  5. Step 5: Solve for x
    x = 115,401.78/378.44
  6. Step 6: Final answer
    x = 304.94

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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.