设前3个数为a-d,a,a+d,因为后3个数成等比数列,所以第4个数为<img width="54" height="41" id="Picture 129" src="/s/tiw/p3/UpLoadImage/2016-08-09/72a7af8d-6a73-4146-a734-27682895703d.png">.<br>根据题意可得<br><span style="display:block;text-align:center;"><img width="128" height="55" id="图片 293" src="/s/tiw/p3/UpLoadImage/2016-08-09/f2d3585b-ccf2-49aa-ac4d-5de491c0768e.png"></span>解这个方程组,得<br><span style="display:block;text-align:center;"><img width="125" height="68" id="图片 296" src="/s/tiw/p3/UpLoadImage/2016-08-09/2eac5e67-ef44-409f-ad70-363dd01c57c9.png"></span>因此所求4个数为12,16,20,25或<img width="99" height="41" id="Picture 128" src="/s/tiw/p3/UpLoadImage/2016-08-09/99a511d2-3e20-4e75-bb8d-053995d9dcfe.png">.
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