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Finding the Fourth Proportional to 427.91, 641.89 and 222.35

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Solution

The fourth proportional to 427.91, 641.89 and 222.35 is: 333.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.91 : 641.89 = 222.35 : x
  2. Step 2: Convert to fraction form
    427.91/641.89 = 222.35/x
  3. Step 3: Cross multiply
    427.91x = 641.89 × 222.35
  4. Step 4: Simplify right side
    427.91x = 142,725.29
  5. Step 5: Solve for x
    x = 142,725.29/427.91
  6. Step 6: Final answer
    x = 333.54

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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.