Problem on check condition on laravel php

I have a problem on my laravel code. I want to check condition and show up using dd my code here.

$ca = floatval($sw->terminal_ca); // $sw->terminal_ca from postgresql type number(8,6) = 0.003480
$max_ca = $this->terminal_ca*(1+($this->tolerance/100)); // $this->terminal_ca from postgresql type number(16,4) = 0.0029
                                                            // $this->tolerance from postgresql type number(16,4) = 20.0000
                                                            

dd(
$ca, 
$max_ca, 
($ca <= $max_ca));

but my result here

not acceptable. it should be true. What’s wrong on my code? How can I solve it?

Answer

I round it before comparison is ok now. Thank @El_Vanja

$ca = round($ca, 6);
$min_ca = round($min_ca, 6);