The number of cups of onion that are needed to make 117 cups of salsa is 
Further explanation:
The proportionality equation can be expressed as follows,

The value of
changes as
changes. If the value of
increases then the value of
is also increasing.
The inversely proportional relationship can be expressed as,

The equation can be expressed as follows,

Here, k is the proportionality constant.
Given:
A salsa recipe uses green pepper, onion, and tomato in the extended ratio 
Explanation:
A salsa recipe uses green pepper, onion, and tomato in the extended ratio 
Let us consider that the amount of green pepper is 
Let us consider that the amount of onion is 
Let us consider that the amount of tomato is 
The total amount green pepper, onion and tomato can be obtained as follows,

There are 117 cups of salsa.
The value of
can be obtained as follows,

The amount of onion used to make 117 cups of salsa can be obtained as follows,

The number of cups of onion that are needed to make 117 cups of salsa is 
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Ratio and proportion
Keywords: proportional, salsa, recipe, green pepper, onion, tomato, extended, ratio, 1:3:9, cups, cups of onion, 117 cups, directly proportional, constant, proportionality equation, constant of proportionality.