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Finding the Fourth Proportional to 644.86, 967.36 and 212.05

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Solution

The fourth proportional to 644.86, 967.36 and 212.05 is: 318.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.86 : 967.36 = 212.05 : x
  2. Step 2: Convert to fraction form
    644.86/967.36 = 212.05/x
  3. Step 3: Cross multiply
    644.86x = 967.36 × 212.05
  4. Step 4: Simplify right side
    644.86x = 205,125.74
  5. Step 5: Solve for x
    x = 205,125.74/644.86
  6. Step 6: Final answer
    x = 318.09

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