Here, we need to find differences between the given numbers.

The differences between the given numbers are:

91 – 43 = 48

183 – 91 = 92

183 – 43 = 140

Now, let’s find the Highest Common Factor of these differences (48, 92, 140) is:

48 = 2 * 2 * 2 * 2 * 3

92 = 2 * 2 * 23

140 = 2 * 2 * 5 * 7

HCF = 2 * 2 = 4

Answer: The greatest number that will divide 43,91 and 183 is 4.