To solve the problem, we can use the formula for finding percent increase:
percent increase = [(new value - old value) / old value] x 100%
Let's substitute the given values into the formula:
percent increase = [(23 - 19) / 19] x 100%
percent increase = 4/19 x 100%
percent increase = 21.05%
Therefore, current movie theater seats are approximately 21.05% wider than theater seats from 30 years ago.