When three numbers $\frac { 9 } { 4 } , a , 4$ form a geometric sequence in this order, what is the value of the positive number $a$? [3 points] (1) $\frac { 8 } { 3 }$ (2) 3 (3) $\frac { 10 } { 3 }$ (4) $\frac { 11 } { 3 }$ (5) 4
When three numbers $\frac { 9 } { 4 } , a , 4$ form a geometric sequence in this order, what is the value of the positive number $a$? [3 points]\\
(1) $\frac { 8 } { 3 }$\\
(2) 3\\
(3) $\frac { 10 } { 3 }$\\
(4) $\frac { 11 } { 3 }$\\
(5) 4