What ratio should be maintained when using a portable extension ladder?

When using a portable extension ladder, maintaining a 4 to 1 ratio is essential for ensuring safety and stability. This means that for every four feet of height reached by the ladder, the base should be positioned one foot away from the wall or vertical surface. This ratio helps to create a stable angle that minimizes the risk of the ladder slipping or tipping over while in use.

The 4 to 1 ratio is widely recognized and recommended by safety organizations and guidelines, as it balances the need for reach with adequate support. It is vital to adhere to this ratio to prevent accidents that could result from improper ladder placement, which can lead to falls or injuries.