In the ICSE Class 7 Mathematics curriculum, the topic of ratio and proportion introduces students to the concept of comparing quantities and understanding their relationship. Students learn about ratios as the comparison of two quantities of the same kind and how to express them in different forms, such as fractions, decimals, and percentages. Proportion is then introduced as an equation stating that two ratios are equal. 

Students also study various applications of ratio and proportion in real-life scenarios, such as in the context of mixtures, maps, and geometry. The goal of this topic is to develop students’ ability to solve problems involving ratios and proportions and to apply these concepts in practical situations.