Ratio, SM-Bank 048 Determine the scale factor if an actual length of 0.3 millimetres represents a scaled length of 15 centimetres. (2 marks) --- 4 WORK AREA LINES (style=lined) --- Show Answers Only \(\dfrac{1}{500}\) Show Worked Solution \(\text{Scale ratio}=\text{scale length}\ :\ \text{actual length}\) \(=15\ \text{cm}\ :\ 0.3\ \text{mm}\) \(=1500\ \text{mm}\ :\ 3\ \text{mm}\) \(=500\ :\ 1\) \(=1\ :\ \dfrac{1}{500}\) \(\text{Scale factor}\) \(=\dfrac{1}{500}\)