I see a shift in proportional reasoning in the middle grades away from using a proportion to solve for a missing value. That is all good and I understand that. I am wondering if there is a good place in the common core for items that find the missing side of similar triangles. For example a light pole, shadow item used to determine the height of the light pole. I do not see a natural place for solving this type item in the CCSS. In 8.G it seems the focus is more on understanding similarity than on solving this type of problem. I see this in HS G-CO and SRT as well, emphasis is on proving similarity rather than using similarity to solve for a missing side. Perhaps this is something for which the focus has shifted and solving these types of problems is not an emphasis. Have I answered my own question or am I missing something obvious? Thanks