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Finding the Fourth Proportional to 837.35, 1,255.90 and 221

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Solution

The fourth proportional to 837.35, 1,255.90 and 221 is: 331.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.35 : 1,255.90 = 221 : x
  2. Step 2: Convert to fraction form
    837.35/1,255.90 = 221/x
  3. Step 3: Cross multiply
    837.35x = 1,255.90 × 221
  4. Step 4: Simplify right side
    837.35x = 277,553.90
  5. Step 5: Solve for x
    x = 277,553.90/837.35
  6. Step 6: Final answer
    x = 331.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.