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If a violin string vibrates at $\pq{440}{Hz}$ as its fundamental frequency, what are the frequencies of the first four harmonics?
The frequencies for both side fixed string are \begin{align} f_n = \frac{nc}{2l} \end{align} for $n=1,\dots,4$. Since $\frac{c}{2l}$ remains constant, the frequencies of the first four harmonics are \begin{align} \pq{440}{Hz} \quad \pq{880}{Hz} \quad \pq{1320}{Hz}\quad \pq{1760}{Hz}. \end{align}