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Question
The America’s famous Golden Gate bridge is 6480 ft long with 756 ft tall towers. A model of this bridge exhibited in a fair is 60 ft long with 7 ft tall towers. Is the model, in proportion to the original bridge?
Solution
6480 : 756, 60 : 7
Product of the means = 756 × 60
= 45360
Product of the extremes = 6480 × 7
= 45360
ad = bc
∴ They are in proportion
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