अशक्तो विंशतेरूर्ध्वं कारयेच्छक्तितस्तदा विष्कम्भपर्वतांस्तद्वत् तुरीयांशेन कल्पयेत् //
aśakto viṃśaterūrdhvaṃ kārayecchaktitastadā viṣkambhaparvatāṃstadvat turīyāṃśena kalpayet //
যদি কোনোবাই বিশ (একক)ৰ ওপৰত কৰিবলৈ অশক্ত হয়, তেন্তে নিজৰ সামৰ্থ্য অনুসাৰে কৰাব। তদ্ৰূপ বিষ্কম্ভ আৰু পৰ্বত-উন্নত অংশসমূহ চতুৰ্থাংশ অনুপাতে নিৰ্ধাৰণ কৰিব।
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.