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Finding the Fourth Proportional to 222.42, 333.38 and 85.40

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Solution

The fourth proportional to 222.42, 333.38 and 85.40 is: 127.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.42 : 333.38 = 85.40 : x
  2. Step 2: Convert to fraction form
    222.42/333.38 = 85.40/x
  3. Step 3: Cross multiply
    222.42x = 333.38 × 85.40
  4. Step 4: Simplify right side
    222.42x = 28,468.56
  5. Step 5: Solve for x
    x = 28,468.56/222.42
  6. Step 6: Final answer
    x = 127.99

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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.