Final answer:
To solve the given proportion, cross multiply by the missing value and simplify the equation to find the answer.
Step-by-step explanation:
To solve the given proportion 3/4 = 6/?, we can use cross multiplication. Cross multiplying gives us 3 * ? = 4 * 6. We then simplify this equation to get ? = (4 * 6)/3 = 8. Therefore, the missing value is 8.
Learn more about Cross multiplication