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Finding the Fourth Proportional to 418.86, 628.67 and 213.57

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Solution

The fourth proportional to 418.86, 628.67 and 213.57 is: 320.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.86 : 628.67 = 213.57 : x
  2. Step 2: Convert to fraction form
    418.86/628.67 = 213.57/x
  3. Step 3: Cross multiply
    418.86x = 628.67 × 213.57
  4. Step 4: Simplify right side
    418.86x = 134,265.05
  5. Step 5: Solve for x
    x = 134,265.05/418.86
  6. Step 6: Final answer
    x = 320.55

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