Step 1:
The first step to converting 273.398172345 to a fraction is to re-write 273.398172345 in the form p/q where p and q are both positive integers. To start with, 273.398172345 can be written as simply 273.398172345/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 273.398172345, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 273.398172345/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 273.398172345/1 each by 1000000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 273.398172345 as a fraction:
29527/108 / 1