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Finding the Fourth Proportional to 486.02, 670.61 and 289.60

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Solution

The fourth proportional to 486.02, 670.61 and 289.60 is: 399.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.02 : 670.61 = 289.60 : x
  2. Step 2: Convert to fraction form
    486.02/670.61 = 289.60/x
  3. Step 3: Cross multiply
    486.02x = 670.61 × 289.60
  4. Step 4: Simplify right side
    486.02x = 194,203.85
  5. Step 5: Solve for x
    x = 194,203.85/486.02
  6. Step 6: Final answer
    x = 399.58

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