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Based on the direct proportionality, we can set up a ratio:
510 spectators / 17 ushers = 1050 spectators / x ushers
Cross multiplying gives:
510 * x = 17 * 1050
510x = 17850
Dividing by 510 on both sides:
x = 35
Therefore, if there are 1050 spectators at the game, 35 ushers are needed.