Given that a: 12=4: 10 find the value of a.

A/12= 4/10

Cross multiply: 12*4= a*10
⇒ a= 12*4/10= 4.8

Final a= 4.8

A:12=4:10

The extremes are a and 10
The middles are 12 and 4

We know that PRODUCT OF MIDDLE = PRODUCT OF EXTREMES
a*10=12*4
a     = 48/10
a     = 4.8

Therefore, the value of a = 4.8