Calculating missing numbers

[Romanseight18]

I have several tables that indicate a cost per measurement. I need to determine costs for sizes that are not provided.

LOW	4	6	8	12	14	16	18	20	24
16	?	?	?	?	?	?	?	?	?
18	?	?	?	?	?	?	?	?	?
20	?	?	53.84	45.39	42.53	40.21	38.25	55.50	51.78
24	?	?	52.28	43.64	40.74	38.39	36.42	51.97	48.05
28	?	?	50.99	42.22	39.28	36.92	34.93	49.16	45.11
32	?	?	49.90	41.02	38.06	35.69	33.70	46.85	42.71
36	?	?	48.96	39.99	37.02	34.63	32.64	44.91	40.70
40	?	?	48.13	39.09	36.11	33.72	31.73	43.24	38.98
44	?	?	47.39	38.30	35.31	32.91	30.92	41.78	37.49
48	?	?	46.73	37.58	34.59	32.19	30.20	40.49	36.18
52	?	?	46.13	36.94	33.94	31.54	29.56	39.34	35.01
56	?	?	45.58	36.36	33.35	30.96	28.97	38.30	33.96

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How do I come up with numbers for where the question marks are? I tried grabbing the handle and spreading out the table and that works for some but not all of the numbers. I have tried trend and growth, but to no avail. I am certain it is something simple that I am doing wrong, but I have not been able to figure out what it is. Notice the smaller the "size" the higher the numbers.

Any help is greatly appreciated!

 

[shg]

Welcome to the board.

Look at this row:

20 ? ? 53.84 45.39 42.53 40.21 38.25 55.50 51.78
Does that look like something smooth that could be extrapolated to the left?

The other rows are similar -- the price goes down and then jumps up.

 

[Romanseight18]

I think I included too many numbers. Sorry! There is a break where the numbers jump. These are numbers that represent a cost for Single Wide Manufactured Homes verses double-wides, which is why the numbers drop and then jump again. I should not have included that second set of numbers. (Not smart on my part!) I should not have included anything to the right of 18.

 

[shg]

Having some insight into what those numbers represent and why they are what they are would guide you on how to extrapolate them. There's no context to the problem, just a bunch of numbers.