Please help me understand?

My mind is completely blanking on the this question. Could someone attempt to explain how to do this as if talking to a simpleton (me)

A third similar laser emits light with intensity 1.5Wm^-2
Work out the amplitude of the light.

It is the sequel to this

One laser emits light that has amplitude 200Vm^-1 and intensity 0.26Wm^-2
Another laser emits light that has amplitude 1 ,300Vm^-1
In all other respects it is identical.
And the answer to this is 0.59Wm^-2

Not sure what is it that you don’t understand.
How you work out the intensity using info from “One laser emits light that has amplitude 200Vm^-1 and intensity 0.26Wm^-2” is also how you work out the amplitude for “A third similar laser emits light with intensity 1.5Wm^-2” based on the relationship: intensity of a wave is proportional to the square of its amplitude.

Did you write more than 2 significant figures for the answer?

Thats the problem; I cant remember how i did the original

Thats the problem; I cant remember how i did the original

I have been staring at this question and threads of how to work out the prequel question to this one for nearly three hours now and I am completely blanking on how I do this. It's really frustrating me because I know it's probably stupidly simple, but I just can't for the life of me figure it out