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Finding the Fourth Proportional to 222.70, 333.90 and 85.69

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Solution

The fourth proportional to 222.70, 333.90 and 85.69 is: 128.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.70 : 333.90 = 85.69 : x
  2. Step 2: Convert to fraction form
    222.70/333.90 = 85.69/x
  3. Step 3: Cross multiply
    222.70x = 333.90 × 85.69
  4. Step 4: Simplify right side
    222.70x = 28,611.89
  5. Step 5: Solve for x
    x = 28,611.89/222.70
  6. Step 6: Final answer
    x = 128.48

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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.