This resource elaborates on the concept of proportions through a practical example of mixing paint to achieve the desired shade of green. It starts by introducing a recipe for mixing blue and yellow paint in specific parts and poses a problem: determining how much blue paint is needed when 15 parts of yellow paint are available. The document defines proportion as an equation where two ratios are equal and presents a paint equation illustrating this concept. It then explains two methods for finding the unknown value: Scaling Up and Cross-Multiplication. Each method is broken down into straightforward steps, demonstrating how to apply these techniques to solve proportions. The resource encourages critical thinking through check-for-understanding questions and discussions. Additionally, it provides practice scenarios to reinforce learning, culminating in a summary of both methods and a reflection on the significance of using equations in problem-solving.