Final answer:
To solve the proportion 1:2 = 4:x, set it up as fractions (1/2 = 4/x) and use cross multiplication. After simplifying, x equals 8.
Step-by-step explanation:
The student's question appears to be asking about solving ratios or proportions based on the given examples. To find x when given a proportion like 1:2 = 4:x, you need to use cross-multiplication. First, set up the proportion as fractions: 1/2 = 4/x. Then, cross multiply to solve for x, which gives you 1x = 8. Finally, divide both sides by 1 to find that x equals 8.