How to perform a math function like divide on two js objects with different properties

Say I have a js object like this;

{'tv':390, 'table':200, 'cup':270, 'chair':325, 'door':300, 'books':290, 'radio':345}

and a second object like so;

{0:30, 1:25, 2:20, 3:35, 4:30, 5:10, 6:15}

How can I for instance perform a division on the first object by the second object per property key? That is {390/30, 200/25, 270/20, ... } The objects have the same number of properties.

The second should be an array.

However I would not trust a for-in to stay in order - This does work though:

var obj = {
  'tv': 390,
  'table': 200,
  'cup': 270,
  'chair': 325,
  'door': 300,
  'books': 290,
  'radio': 345
}
var divis = [30, 25, 20, 35, 30, 10, 15];
var cnt = 0;
for (var o in obj) {
  console.log(obj[o] / divis[cnt]);
  cnt++
}

// OR
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
  console.log(obj[keys[i]] / divis[i]);
}