Let the length of the mast of the model ship be x cm.
The given information in the form of a table is as follows:
| -- | Height of mast | Length of ship |
| Model ship | 9 cm | x |
| Actual ship | 12 m | 28 m |
We know that the dimensions of the actual ship and the model ship are directly
proportional to each other.
Therefore, we obtain:
19/2 = 28/x
x = (28 x 9)/12 = 12
Thus, the length of the model ship is 21 cm.
