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Finding the Fourth Proportional to 222.22, 331.61 and 215.74

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Solution

The fourth proportional to 222.22, 331.61 and 215.74 is: 321.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.22 : 331.61 = 215.74 : x
  2. Step 2: Convert to fraction form
    222.22/331.61 = 215.74/x
  3. Step 3: Cross multiply
    222.22x = 331.61 × 215.74
  4. Step 4: Simplify right side
    222.22x = 71,541.54
  5. Step 5: Solve for x
    x = 71,541.54/222.22
  6. Step 6: Final answer
    x = 321.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.