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Finding the Fourth Proportional to 485.25, 669.66 and 310.92

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Solution

The fourth proportional to 485.25, 669.66 and 310.92 is: 429.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.25 : 669.66 = 310.92 : x
  2. Step 2: Convert to fraction form
    485.25/669.66 = 310.92/x
  3. Step 3: Cross multiply
    485.25x = 669.66 × 310.92
  4. Step 4: Simplify right side
    485.25x = 208,210.69
  5. Step 5: Solve for x
    x = 208,210.69/485.25
  6. Step 6: Final answer
    x = 429.08

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