The given cones are similar .Similar figures have sides in proportion.
Forming the proportion for similar sides in the two cones we have:
[tex]\frac{10}{3}.=\frac{3}{x}.[/tex]
This is of the form :[tex]\frac{a}{b} = \frac{c}{d}.[/tex]
We can cross multiply.
Cross multiplying we have:
10x=9
Dividing both sides by 10 we have
x=[tex]\frac{9}{10}.[/tex]
x=0.90.
