b5 = √b4 * b6 = √25 * 9=5 * 3=15
q = b5 : b4 = 15 : 25 = 3/5
b3 = b4 : q=25 : 3/5 = 25 * 5/3 = 125/3
b2 = b3 : q = 125/3 : 3/5 = 125/3 * 5/3=625/9
b1 = b2 : q= 625/9 : 3/5= 625/9 * 5/3= 3125/27
b5 = √b4 * b6 = √25 * 9=5 * 3=15
q = b5 : b4 = 15 : 25 = 3/5
b3 = b4 : q=25 : 3/5 = 25 * 5/3 = 125/3
b2 = b3 : q = 125/3 : 3/5 = 125/3 * 5/3=625/9
b1 = b2 : q= 625/9 : 3/5= 625/9 * 5/3= 3125/27