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La tercera proporcional de 9 y a es 25
9 a
--- = ----- 9x25 = a² ⇒225 = a²
a 25 15 = a
La cuarta proporcional:
a 12
----- = ------
35 ??
Reemplazamos a= 15
420
15 12 15 x ?? = 35 x 12 ?? = -----------
---- = ------ 15
35 ?? ?? = 28
Respuesta ; la cuarta proporcional es 28