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Finding the Fourth Proportional to 645.81, 968.71 and 212.97

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Solution

The fourth proportional to 645.81, 968.71 and 212.97 is: 319.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.81 : 968.71 = 212.97 : x
  2. Step 2: Convert to fraction form
    645.81/968.71 = 212.97/x
  3. Step 3: Cross multiply
    645.81x = 968.71 × 212.97
  4. Step 4: Simplify right side
    645.81x = 206,301.33
  5. Step 5: Solve for x
    x = 206,301.33/645.81
  6. Step 6: Final answer
    x = 319.45

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