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I have a solid green rectangle.

I would like to create several similar green rectangles at various levels of transparency that will perfectly match the color of the solid green rectangle. Is there an easy way to do this?

I have tried matching it by eye, and can get very close:

the original solid green rectangle is R:135 G: 174 B: 155

after making a copy of the solid green rectangle, say,  90% transparent, I can play with Hue/Saturation to get around R:136 G:175 B: 154, according to the eyedropper. But I don't see any way of fine tuning the RGB/HSB/etc. absolute values in the transparent version.

Am I using the wrong tool? Should be using Replace color? Match color?