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Finding the Fourth Proportional to 21.68, 32.56 and 19

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Solution

The fourth proportional to 21.68, 32.56 and 19 is: 28.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.68 : 32.56 = 19 : x
  2. Step 2: Convert to fraction form
    21.68/32.56 = 19/x
  3. Step 3: Cross multiply
    21.68x = 32.56 × 19
  4. Step 4: Simplify right side
    21.68x = 618.64
  5. Step 5: Solve for x
    x = 618.64/21.68
  6. Step 6: Final answer
    x = 28.54

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