अशक्तो विंशतेरूर्ध्वं कारयेच्छक्तितस्तदा विष्कम्भपर्वतांस्तद्वत् तुरीयांशेन कल्पयेत् //
aśakto viṃśaterūrdhvaṃ kārayecchaktitastadā viṣkambhaparvatāṃstadvat turīyāṃśena kalpayet //
إن عجز المرء عن إنجاز (العمل الموصوف) بما يزيد على عشرين (وحدة)، فليُنجَز بحسب الطاقة. وكذلك تُقَدَّر المقاييس العرضية (viṣkambha) والأجزاء المرتفعة (parvata) بنسبةٍ تُؤخذ فيها حصة الربع (turīyāṁśa).
This verse does not address Pralaya; it gives practical Vastu guidance on scaling construction measurements when one cannot follow the full prescribed dimension.
It frames dharmic practicality: a patron (king/householder) should undertake building works within means, maintaining proportional harmony rather than abandoning the project or violating core design ratios.
It authorizes proportional reduction—especially using a quarter-share rule (turīyāṁśa)—for key dimensions like breadth/diameter (viṣkambha) and raised elements (parvata), preserving canonical Vastu symmetry under constraints.