6,3:10=

To solve the proportion \(6,3:10\), we should interpret it as a ratio.

The expression can be read as \( \frac{6.3}{10} \).

To evaluate this, you simply perform the division:

\[ \frac{6.3}{10} = 0.63 \]

Thus, \(6.3:10\) equals \(0.63\).