The servant wasn’t capable of going to Jesus himself. So the centurion, his master, went to Jesus on his behalf. 
Jesus, honoring the intercessory prayer, healed the sick man. 
Our intercessory prayers are valuable. They yield results. When the Spirit brings someone to your mind: pray for them. When you have a burden for someone’s situation: pray for them. When you feel a responsibility towards someone: pray for them. Your effectual, fervent prayers won’t be dismissed. They will availeth much. 
Scripture taken from: Matthew 8:5-13