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Finding the Fourth Proportional to 427.36, 641.05 and 119.21

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Solution

The fourth proportional to 427.36, 641.05 and 119.21 is: 178.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.36 : 641.05 = 119.21 : x
  2. Step 2: Convert to fraction form
    427.36/641.05 = 119.21/x
  3. Step 3: Cross multiply
    427.36x = 641.05 × 119.21
  4. Step 4: Simplify right side
    427.36x = 76,419.57
  5. Step 5: Solve for x
    x = 76,419.57/427.36
  6. Step 6: Final answer
    x = 178.82

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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.