how can i write formula for the following

[naderassaleh]

hi again
can i apply interpolation to the following situation (i did try many many times but i couldnt)

AIRCRAFT REGISTRATION
JYAIA
FUEL QUANTITY 28400
FUEL DENSITY 3.08

THEN FUEL INDEX IS -21

I WANT TO FIND WAY TO LET EXCEL TAKE THE NEXT FUEL QUANTITY FROM THE TABLE (29000)
AND GET ITS FUEL INDEX VALUE -24 AND INTERPOLATE THEM....
THANK YOU NUCH
book2.xlsx

[Fotis1991]

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