Margaret P. Bechtold, 53, a public relations official at the International Bank of Washington, was fatally injured Thursday when she was struck by an automobile on Carlyn Springs Road near S. Seventh Street in Arlington.

Arlington County police said Mrs. Bechtold was hit by a car driven by Constantine Radoulovitch as she was crossing Carlyn Springs Road. She was taken to Arlington Hospital, where she died about an hour later.

Mrs. Bechtold moved to the Washington area and joined the International Bank in 1972. Since then, she had earned a master's degree in public relations from American University. She was accredited by the Public Relations Society of America and was a member of the board of the organization's D.C. chapter.

Mrs. Bechtold was born in Brooklyn, N.Y. She grew up in Philadelphia and in the Midwest.She attended Kansas State Teachers College and McPherson College in McPherson, Kan., and then taught school in Kansas City, Kan., and Wadley, Ala.

In 1960, she moved to San Juan P.R., where she became an administrator and community relations aide for the San Juan Star newspaper. In 1971, she was named "woman of the year" by the Puerto Rico Chamber of Commerce for development work with the World University and with women's professional and business groups. She came to Washington a year later.

Her marriage to Hororio Hernandez, of San Juan, ended in divorce and she resumed her maiden name.

Survivors include three daughters, Ginger Prichard, of Boston, Cheryl Flory, of Falls Church, and Margaret Hernandez, of the home in Falls Church; a son, Frank Hernandez, also of the home; her father, the Rev. Paul F. Bechtold, of Grinnell, Iowa, and two sisters, Elaine Waggener, of Falls Church, and Helen Cotney, of Huntsville, Ala.

The family suggests that expressions of sympathy be in the form of contributions to the Margaret P. Bechtold Scholarship Fund, National Capital Chapter, Public Relations Society of America, Washington.