Architects have a special way of using ratios to make buildings that look good and work well. By using certain ratios, they can create designs that feel balanced and harmonious. One popular ratio is called the Golden Ratio, which is about $1:1.618$. This ratio is often found in nature and helps make architectural designs feel beautiful and symmetrical.

For example, when an architect designs the outside of a building, they might use the Golden Ratio to decide how big the windows should be in relation to the walls. If a window is 1 meter tall, it should ideally be about $1.618$ meters wide. This creates a pleasing look.

Ratios are also very important when architects make scale models. A scale model is a smaller version of the building. If the architect uses a scale of $1:100$, every 1 cm in the model represents 100 cm in real life. This way, they can see what the design will look like and make changes before building the real structure.

Using ratios also helps architects use materials wisely. When figuring out how much of different materials to use, an architect might choose a ratio of $3:1:2$ for wood, steel, and concrete. This kind of careful planning is key during both the design and building stages. It leads to creations that are not only beautiful but also strong and good at using resources.