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A double number line is very similar to a ratio table in that you use them to solve problems requiring proportions. The ratio table is more flexible in that you do not need to position the numbers in the "correct" position. If you google using models in realistic mathematics education you will find references to these and ideas how they might be used in the classroom
use proportions
A calculator can be used to proportions to answer a equation. This is easier to solve when having variables on both sides.
If a persons leg is in the wrong grave, they use proportions to calculate which percentage of the body is missing.
medication calculations/ ratio proportions/ medication administration/ kg per mg for meds given to children-in pediatrics etc........