38% basically means \(\frac{38}{100}\) right?
If we let the unknown number be \(N\), then
N x \(\frac{38}{100}\) = 19
Just reverse it now!
N x \(\frac{38}{100}\) = 19
N = 19 / \(\frac{38}{100}\)
N = 19 x \(\frac{100}{38}\)
N = 50
Therefore, 19 is 38% of 50