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Finding the Fourth Proportional to 222.91, 334.38 and 85.99

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Solution

The fourth proportional to 222.91, 334.38 and 85.99 is: 128.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.91 : 334.38 = 85.99 : x
  2. Step 2: Convert to fraction form
    222.91/334.38 = 85.99/x
  3. Step 3: Cross multiply
    222.91x = 334.38 × 85.99
  4. Step 4: Simplify right side
    222.91x = 28,751.66
  5. Step 5: Solve for x
    x = 28,751.66/222.91
  6. Step 6: Final answer
    x = 128.99

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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.