can someone help me with this please?

Answer:
Big triangle= 4*1.5=6
Small Triangle= 7.5/1.5=5
Ratio=7.5/5 or 1.5
Step-by-step explanation:
[tex]\frac{7}{10.5}[/tex]=[tex]\frac{x}{7.5}[/tex]
cross multiply
10.5x=52.5
divide both sides by 10.5
x=5
7.5/5= ratio