A "1:200 ratio" means that for every 1 unit of one quantity, there are 200 units of another quantity. This ratio is often used in various fields, such as mathematics, engineering, and architecture, to represent proportions or comparisons between different elements. For example, in a scale model, a 1:200 ratio indicates that 1 unit on the model represents 200 units in real life. In practical terms, if you have a model that is 1 meter long at a 1:200 scale, the actual object it represents would be 200 meters long. Ratios like this help in visualizing and understanding the size differences between objects, making them essential for design and planning purposes.