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Finding the Fourth Proportional to 1,120.80, 1,680 and 471.36

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Solution

The fourth proportional to 1,120.80, 1,680 and 471.36 is: 706.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.80 : 1,680 = 471.36 : x
  2. Step 2: Convert to fraction form
    1,120.80/1,680 = 471.36/x
  3. Step 3: Cross multiply
    1,120.80x = 1,680 × 471.36
  4. Step 4: Simplify right side
    1,120.80x = 791,884.80
  5. Step 5: Solve for x
    x = 791,884.80/1,120.80
  6. Step 6: Final answer
    x = 706.54

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