Find the 4th proportion of 25,30,16.
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Answer: 4th proportion = 19 1/5
Step-by-step explanation: 25:30::16:x
⇒ 25x = 16 × 30
⇒ 25x = 480
⇒ x = 480 ÷ 25
⇒ x = 96/5
⇒ x = 19 1/5
∴ The fourth proportion = 19 1/5
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96/5
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