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Finding the Fourth Proportional to 485.06, 668.79 and 310.23

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Solution

The fourth proportional to 485.06, 668.79 and 310.23 is: 427.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.06 : 668.79 = 310.23 : x
  2. Step 2: Convert to fraction form
    485.06/668.79 = 310.23/x
  3. Step 3: Cross multiply
    485.06x = 668.79 × 310.23
  4. Step 4: Simplify right side
    485.06x = 207,478.72
  5. Step 5: Solve for x
    x = 207,478.72/485.06
  6. Step 6: Final answer
    x = 427.74

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