The Hong Kong Museum exhibits a 50cm long dinosaur fossil model. The ratio of its length to the actual length is 1:10. What is the actual length of this dinosaur fossil? (Solve with ratio)
香港博物馆展出一个长50cm的恐龙化石模型，它的长度和实际长度的比是1：10，这件恐龙化石的实际长度是多少？(用比例解)
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 / (1/10)</gadget>
<output>500</output>

<result>500</result>