Manipulate the given list such that all numbers are multiplied by 3.
[1, 2, 3, 4]
Here's the manipulated list with all elements multiplied by 3:
[3, 6, 9, 12]
Complete the following task based on the instruction and optional input provided.### Instruction:
Manipulate the given list such that all numbers are multiplied by 3.

### Input:
[1, 2, 3, 4]

### Output:
Here's the manipulated list with all elements multiplied by 3:
[3, 6, 9, 12]