1 is 25% of 4.
Step 1: Translate the words into an equation.
| 1 | is | what percent | of | 4 |
| 1 | = | x | $ \cdot $ | 4 |
Step 2: Solve for $ x $.
$$ \begin{aligned} 1 &= x \cdot 4 \\[1.2 em] 4 \cdot x &= 1 \\[1.2 em] x &= \dfrac{ 1 }{ 4 } \\[1.2 em] x &= 0.25 \end{aligned} $$Step 3: Express $ x $ as a percentage.
$$ x = 0.25 = 0.25 ~~\cdot~~ 100 \% = 25 \% $$