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Finding the Fourth Proportional to 427.75, 641.78 and 222.19

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Solution

The fourth proportional to 427.75, 641.78 and 222.19 is: 333.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.75 : 641.78 = 222.19 : x
  2. Step 2: Convert to fraction form
    427.75/641.78 = 222.19/x
  3. Step 3: Cross multiply
    427.75x = 641.78 × 222.19
  4. Step 4: Simplify right side
    427.75x = 142,597.10
  5. Step 5: Solve for x
    x = 142,597.10/427.75
  6. Step 6: Final answer
    x = 333.37

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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.