The split is to reign in the share count. You do not lose dollar amount value when there is a reverse. If the shares are reduced, the value of the shares are increased an equal amount so the dollar value stays the same.

If you have 100 shares valued at $1 a share, that's $100 value.

A 4:1 reverse means you have 25 shares but they are now worth $4 a share so the $100 value stays the same.

Also, the percentage of the company that you own stays the same.

Does that make sense?