someone help me i really need it

Answer:
Missing value is 8 cm
Step-by-step explanation:
» Using scale factors:
[tex]{ \tt{ \frac{smaller \: length}{bigger \: length} = \frac{smaller \: width}{bigger \: width} }} \\ [/tex]
» We need bigger length (EG) or I
[tex]{ \tt{ \frac{6}{l} = \frac{3}{4} }} \\ \\ { \tt{l = \frac{6 \times 4}{3} }} \\ \\ { \tt{l = 8}}[/tex]