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Finding the Fourth Proportional to 427.75, 641.50 and 119.61

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Solution

The fourth proportional to 427.75, 641.50 and 119.61 is: 179.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.75 : 641.50 = 119.61 : x
  2. Step 2: Convert to fraction form
    427.75/641.50 = 119.61/x
  3. Step 3: Cross multiply
    427.75x = 641.50 × 119.61
  4. Step 4: Simplify right side
    427.75x = 76,729.52
  5. Step 5: Solve for x
    x = 76,729.52/427.75
  6. Step 6: Final answer
    x = 179.38

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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.