I try not divided by 0 

I have variable with the Yearky Results this is the code
IF((AND(ISBLANK(Q1_c__c),ISBLANK(Q2_c__c),ISBLANK(Q3_c__c),ISBLANK(Q4_c__c))), 0,

IF((Q1_c__c + Q2_c__c + Q3_c__c + Q4_c__c) = Goal_Number__c,Goal_Number__c,

(((Q1_c__c + Q2_c__c + Q3_c__c + Q4_c__c)/Goal_Number__c)/4)))

With 4 Quarents with results 
 
Variable = Q1_c__c
IF(OR(ISBLANK(Q1_Value__c),ISBLANK(Q1_Goal__c)),0,Q1_Value__c / Q1_Goal__c) 

By in this quarter variables in one year you can use one quarter only or two or 3 or used all. And add to this you go over of 5,000 caracters in each formula. How can i do this 

I try not divided by 0 

I have variable with the Yearky Results this is the code
IF((AND(ISBLANK(Q1_c__c),ISBLANK(Q2_c__c),ISBLANK(Q3_c__c),ISBLANK(Q4_c__c))), 0,

IF((Q1_c__c + Q2_c__c + Q3_c__c + Q4_c__c) = Goal_Number__c,Goal_Number__c,

(((Q1_c__c + Q2_c__c + Q3_c__c + Q4_c__c)/Goal_Number__c)/4)))

With 4 Quarents with results 
 
Variable = Q1_c__c
IF(OR(ISBLANK(Q1_Value__c),ISBLANK(Q1_Goal__c)),0,Q1_Value__c / Q1_Goal__c) 

By in this quarter variables in one year you can use one quarter only or two or 3 or used all. And add to this you go over of 5,000 caracters in each formula. How can i do this