Repro steps :

1. Build & deploy user attached project to iOS device.
2. Notice console output where actual magnitude is different than expected.

It seems that Mathf.Sqrt() is also producing not consistent results between platforms.

Reproduced on: 5.3.5f1, 5.4.0f3, 5.5.0b1

RESOLUTION:

The precision of intermediate results is unspecified by the IEEE-754 standard. It can not be relied on.

For more reading, see http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html#3098