Is it permissible for a husband to marry another woman with the intention of solving the problem of spinsterhood, even if this might lead to the divorce of his first wife, who cannot tolerate a second wife?

Contribution to solving the problem of spinsterhood is not an obligation for polygyny, and polygyny does not justify a woman seeking divorce from her husband. The detailed explanation is that the original ruling on polygyny is permissibility for one who is capable of it, on condition of justice. Polygyny is not obligatory, and solving the problem of spinsterhood is one of the wisdoms and objectives of polygyny, but it does not make it obligatory. It is advised to try to reach an understanding with the husband and express her desire for him to be exclusively hers. If he does not respond, then this is his right, and she must be content with what Allah has permitted for him, and she should not seek divorce merely because of polygyny, and she should reduce her jealousy.