The scale ratio of a model is the proportionate ratio of the model's linear dimensions to the equivalent characters. The actual mural will be 5 inches wide and 11 inches tall.
The scale ratio of a model is the proportionate ratio of one of the model's linear dimensions to the equivalent characters in the original.
As it is given that Arnold is using a scale in which 12 inches represents 1 foot to paint the mural. but since we know that 12 inches are equal to 1 foot.
Therefore, the actual mural will also be 5 inches wide and 11 inches tall.
Learn more about Scaling Ratio:
https://brainly.com/question/13267344