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Finding the Fourth Proportional to 750, 1,125 and 287.80

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Solution

The fourth proportional to 750, 1,125 and 287.80 is: 431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    750 : 1,125 = 287.80 : x
  2. Step 2: Convert to fraction form
    750/1,125 = 287.80/x
  3. Step 3: Cross multiply
    750x = 1,125 × 287.80
  4. Step 4: Simplify right side
    750x = 323,775
  5. Step 5: Solve for x
    x = 323,775/750
  6. Step 6: Final answer
    x = 431.70

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