Use the form below to do your conversion.
Solution
Step1
Log217405=Log(7405) ÷ Log(21)
Log(7405)= 3.8695250628572
Log(21)=1.3222192947339
Log217405=3.8695250628572 ÷ 1.3222192947339
Ans=2.9265380396948
Step2
Alternatively, the logarithm can be calculated like this.