Tools
Checkers
Quick-check tools that tell you whether a table, graph, equation, or cross multiplication shows a proportional relationship.
Cross Multiplication Checker
Check your cross multiplication work and solve missing values in proportions.
a:b = c:d → a×d = b×c
Is This Graph Proportional? Checker
Enter points or values to check whether a graph shows a proportional relationship and why.
Line through (0,0) and all y÷x = k
Proportional Table Checker
Enter table values to test whether the relationship is proportional and identify the constant.
k = y₁÷x₁ = y₂÷x₂ = y₃÷x₃
Proportional Equation Checker
Check whether an equation represents a proportional relationship and identify the constant.
y = kx (proportional) vs y = kx + b (not proportional)