Question

is it always,sometimes, or never true that a scatter plot that shows a positive association suggest that the relationship is proportional? answer

Answer 1

When a scatter plot shows a positive association means that there is a linear correlation with a positive slope between the two variables. This correlation can be weaker or stronger (depending on the value of the correlation).
If there is a linear correlation between the two variables, the relation is then a direct proportionality (with slope positive or negative).

Hence, it is always true that a scatter plot that shows a positive association suggests that the relationship is proportional.