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Finding the Fourth Proportional to 427.69, 641.69 and 222.13

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Solution

The fourth proportional to 427.69, 641.69 and 222.13 is: 333.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.69 : 641.69 = 222.13 : x
  2. Step 2: Convert to fraction form
    427.69/641.69 = 222.13/x
  3. Step 3: Cross multiply
    427.69x = 641.69 × 222.13
  4. Step 4: Simplify right side
    427.69x = 142,538.60
  5. Step 5: Solve for x
    x = 142,538.60/427.69
  6. Step 6: Final answer
    x = 333.28

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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.