A ratio of 1:15 indicates a relationship between two quantities, where for every 1 unit of the first quantity, there are 15 units of the second. This can be applied in various contexts, such as mixing ingredients in a recipe or comparing sizes. For example, if you have 1 cup of sugar and want to maintain a 1:15 ratio, you would need 15 cups of flour. In practical terms, this ratio helps in understanding proportions. If you were to scale up a recipe or a model, maintaining the 1:15 ratio ensures that the relationship between the components remains consistent. This is crucial in fields like cooking, engineering, and finance.