What is a Proportional Relationship?
A proportional relationship describes a connection between two quantities where their **ratio is constant**. This means that as one quantity changes, the other changes by the same factor. This constant ratio is called the **constant of proportionality**, or **k**.
The equation for a proportional relationship is: $$y = kx$$ where **y** and **x** are the two quantities and **k** is the constant of proportionality.
Score: 0
Streak: 0
Video: The "k" Factor 💰
Watch this video to understand how the constant of proportionality works with a real-world example.
Practice Problems
Determine if each relationship is proportional. If it is, find the constant of proportionality (k).
1) Table: Is it proportional?
| x | 2 | 4 | 6 |
| y | 6 | 12 | 18 |
2) Find k for problem 1.
3) Table: Is it proportional?
| x | 1 | 2 | 3 |
| y | 3 | 5 | 7 |
4) Graph: Is it proportional?
A line that goes through the origin (0,0) and is a straight line.
⚡ Proportionality Speed Quiz
Time: 0
Correct: 0
Press Start
Download CSV Log
Track all practice & quiz answers in a CSV file.