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📰 We want positive ratio. Try $ y = \frac{-7 + \sqrt{7}}{9} \approx \frac{-7 + 2.6458}{9} = \frac{-4.3542}{9} \approx -0.484 $, negative. Other root: $ \frac{-7 - 2.6458}{9} < 0 $. Both negative — meaning $ A/d < 0 $, so first and last have opposite signs — impossible for $ A^2 + (A+3d)^2 = (sum)^2 $ unless not ordered. 📰 Wait — the original assumption about ordering may be wrong. Try symmetric AP: let the four terms be $ a - 3d, a - d, a + d, a + 3d $ — symmetric around $ a $. This is a valid arithmetic progression with common difference $ 2d $, but we can scale. Define as AP with common difference $ 2d' $, but to match convention, let common difference be $ 2d $, so terms: $ a - 3d, a - d, a + d, a + 3d $. Then first: $ a - 3d $, last: $ a + 3d $, sum of squares: $ (a-3d)^2 + (a+3d)^2 = 2a^2 + 18d^2 $. Sum of all: $ 4a $, square: $ 16a^2 $. Set equal: 📰 2a^2 + 18d^2 = 16a^2 \Rightarrow 18d^2 = 14a^2 \Rightarrow \frac{d^2}{a^2} = \frac{14}{18} = \frac{7}{9}. 📰 Youll Fax Anything From Your Computerfind Out How In This Instant Guide 8532365 📰 Jill Teed 7728528 📰 Exclusive Insiders Reveal Instituto Tecnolgico Aeronuticas Secret To Aerospace Element Success 99264 📰 A Little Horse Nyt 2977978 📰 Step Into Virtual Style These Fashion Games Are Outselling Players Alive 6313235 📰 Land A Competitive Internship At Oracleheres How To Beat The Competition 366315 📰 The Unbelievable Rally Valladolids Magic Shocks Barcelona 325608 📰 Q 25 1326636 📰 Apple Store Soho New York 5940149 📰 Gyp Rosetti 3249660 📰 God Bless You In Spanish 1431486 📰 Fulham England 9082856 📰 Master Ms Office 2013 Like A Prothis Free Guide Will Transform Your Productivity 7367520 📰 3 Get Trapped Inside This Portal Escape Its Harder Than It Looks 536276 📰 How To Make Big Profits In Just Weeks Short Term Investments That Work 1282830