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Finding the Fourth Proportional to 666, 919.24 and 390.16

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Solution

The fourth proportional to 666, 919.24 and 390.16 is: 538.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    666 : 919.24 = 390.16 : x
  2. Step 2: Convert to fraction form
    666/919.24 = 390.16/x
  3. Step 3: Cross multiply
    666x = 919.24 × 390.16
  4. Step 4: Simplify right side
    666x = 358,650.68
  5. Step 5: Solve for x
    x = 358,650.68/666
  6. Step 6: Final answer
    x = 538.51

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