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Finding the Fourth Proportional to 222.43, 333.69 and 85.53

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Solution

The fourth proportional to 222.43, 333.69 and 85.53 is: 128.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.43 : 333.69 = 85.53 : x
  2. Step 2: Convert to fraction form
    222.43/333.69 = 85.53/x
  3. Step 3: Cross multiply
    222.43x = 333.69 × 85.53
  4. Step 4: Simplify right side
    222.43x = 28,540.51
  5. Step 5: Solve for x
    x = 28,540.51/222.43
  6. Step 6: Final answer
    x = 128.31

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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.