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Finding the Fourth Proportional to 378.37, 522.11 and 221

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Solution

The fourth proportional to 378.37, 522.11 and 221 is: 304.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.37 : 522.11 = 221 : x
  2. Step 2: Convert to fraction form
    378.37/522.11 = 221/x
  3. Step 3: Cross multiply
    378.37x = 522.11 × 221
  4. Step 4: Simplify right side
    378.37x = 115,386.31
  5. Step 5: Solve for x
    x = 115,386.31/378.37
  6. Step 6: Final answer
    x = 304.96

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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.