Practice: Solving Equivalent Ratio Problems

① This GeoGebra example demonstrates how to solve equivalent ratio problems interactively, typically involving equations like a:b = c:d where one term is unknown. ② The core mathematical concepts are ratios and proportions, including the cross-multiplication property, simplifying ratios, and applying proportional relationships to real-world contexts such as speed, concentration, or similar geometric figures. ③ Construction notes: although no specific GeoGebra commands are listed, such practice activities usually employ text inputs, sliders, or dynamic numeric displays to represent ratio relationships, possibly using the Algebra View and Spreadsheet to let users adjust values and observe changes, verifying equivalence. ④ It is suitable for upper elementary to middle school students, serving as classroom practice or self-study reinforcement, and can also be used by teachers as a dynamic demonstration of proportional properties.