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Finding the Fourth Proportional to 645.18, 967.91 and 212.32

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Solution

The fourth proportional to 645.18, 967.91 and 212.32 is: 318.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.18 : 967.91 = 212.32 : x
  2. Step 2: Convert to fraction form
    645.18/967.91 = 212.32/x
  3. Step 3: Cross multiply
    645.18x = 967.91 × 212.32
  4. Step 4: Simplify right side
    645.18x = 205,506.65
  5. Step 5: Solve for x
    x = 205,506.65/645.18
  6. Step 6: Final answer
    x = 318.53

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