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Finding the Fourth Proportional to 222.42, 333.56 and 85.43

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Solution

The fourth proportional to 222.42, 333.56 and 85.43 is: 128.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.42 : 333.56 = 85.43 : x
  2. Step 2: Convert to fraction form
    222.42/333.56 = 85.43/x
  3. Step 3: Cross multiply
    222.42x = 333.56 × 85.43
  4. Step 4: Simplify right side
    222.42x = 28,495.94
  5. Step 5: Solve for x
    x = 28,495.94/222.42
  6. Step 6: Final answer
    x = 128.12

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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.