If $321_{b}$ is equal to the base 10 integer 57, find $b$ given that $b>0$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $321_{b}$ is equal to the base 10 integer 57, find $b$ given that $b>0$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
If $321_{b}$ is equal to the base 10 integer 57, find $b$ given that $b>0$.
train