Javascript lookup table

I have an object which holds my data.

 DataSoccer: [{ 0: '0.00', 1: '10.4', 2:'100.5', 3:'15.3', 4:'11.2', 5:'15.9'}]

when the key values are whole this is simple.

DataSoccer[0][3] //returns 10.4

The problem is the indexes are now not whole

  DataSoccer: [{ 0: '0.00', 1.30: '10.4', 2.40:'100.5', 3.40:'15.3', 4.5:'11.2', 5:'15.9'}]

so I get a user input, say 2.30 and that should return 10.4 (the second index)

At the moment I have an if statement

if (value == 0 {
return 0.00
}
else if (value <= 1.30) {
   return 10.4
}

else if (value <= 2.40) {
   return 100.5
}

As you can imagine this lookup functionality using an if-else can get pretty cumbersome and was wondering if there was a better way?