Crop & Export

After cropping to a set size like 5x7 is there a way to export from Lightroom and actually have the image be a 5x7. The concern for example is that even though Lightroom is exporting the image from the 5x7 crop it is doing so at a larger dimension even though proportionate. this creates file sizes larger than I need. When I export a 5x7 I want my final image that I open in PhotoShop to be 5x7 not 7.787 X 10.9. PhotoShops Raw program will export to the actual crop size why does Lightroom not support this feature?
Crop %26 Export
sk-
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%26lt;br /%26gt;Try setting up an export template that has the ppi you want (such as 240, 300, 360) with the number of pixels per side constrained on the long side to equal 7''?
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%26lt;font br='''' /%26gt;%26lt;/font%26gt; color=''#600000'' size=''2''%26amp;gt;~~ John McWilliams
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%26lt;br /%26gt;MacBookPro 2 Ghz Intel Core Duo, G-5 Dual 1.8; Canon DSLRs
Crop %26 Export
sk - what John says works well, it is just thinking different as LR works in pixel dimensions not ruler measurements