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Finding the Fourth Proportional to 222.92, 336.80 and 221

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Solution

The fourth proportional to 222.92, 336.80 and 221 is: 333.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.92 : 336.80 = 221 : x
  2. Step 2: Convert to fraction form
    222.92/336.80 = 221/x
  3. Step 3: Cross multiply
    222.92x = 336.80 × 221
  4. Step 4: Simplify right side
    222.92x = 74,432.80
  5. Step 5: Solve for x
    x = 74,432.80/222.92
  6. Step 6: Final answer
    x = 333.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.