What component needs to be added to display a ratio of cases that flow through the activity "Delete Purchase Order Items"?

To display a ratio of cases that flow through the activity "Delete Purchase Order Items," the most suitable component is a Number (Single KPI). This choice is appropriate because a Single KPI component is specifically designed to present key performance indicators in a clear and concise manner, allowing users to quickly ascertain the proportion of cases relative to this activity.

KPI components typically highlight significant metrics in a manner that is easy to interpret, enabling stakeholders to assess performance effectively at a glance. In this case, showing a ratio directly correlates to the goal of tracking a specific measure against the total number of relevant cases.

Other types of components, like tables, line charts, or pie charts, serve different analytical purposes. Tables, for instance, are meant for displaying detailed numerical data or comparisons rather than highlighting a single ratio. Line charts are used to show trends over time, while pie charts represent parts of a whole but do not effectively communicate ratios in a straightforward manner as a KPI would. Thus, opting for a Number (Single KPI) is the best approach for presenting the intended ratio.