The expression, 0.261 is referred to as a decimal fraction.
To convert it to an ordinary fraction multiply it by the relevant power of 10 to convert it to a number with NO portion AFTER the decimal point, put the relevant power of 10 as the denominator and see if the fraction can be simplified.
0.261 = 0.261 x 1000 / 1000 = 261/1000
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475_1,000
77/100 is the lowest you can go with that fraction.
78/125
241/20
Not sure about wright, but I would write it as 4/15