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Finding the Fourth Proportional to 222.90, 334.28 and 85.94

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Solution

The fourth proportional to 222.90, 334.28 and 85.94 is: 128.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.90 : 334.28 = 85.94 : x
  2. Step 2: Convert to fraction form
    222.90/334.28 = 85.94/x
  3. Step 3: Cross multiply
    222.90x = 334.28 × 85.94
  4. Step 4: Simplify right side
    222.90x = 28,728.02
  5. Step 5: Solve for x
    x = 28,728.02/222.90
  6. Step 6: Final answer
    x = 128.88

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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.