We are given :
The ratio of orange juice to pineapple juice in tropical treat punch = 4:3 or 4/3.
Number of oz of orange juice = 64 oz.
Let us assume number of oz pineapple juice does he need = p.
We can setup an proportion:
64 : p = 4 : 3
![(64)/(p) = (4)/(3)](https://img.qammunity.org/2019/formulas/mathematics/high-school/h4uh81jznc4fqluri6ybrfcgxq5t2z3ee1.png)
On cross multiplication we get
64 × 3 = 4 × p
192 = 4p
Dividing both sides by 4, we get
p = 48.
Therefore, he needs 48 oz of pineapple juice.