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Finding the Fourth Proportional to 19.22, 28.80 and 18.45

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Solution

The fourth proportional to 19.22, 28.80 and 18.45 is: 27.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.22 : 28.80 = 18.45 : x
  2. Step 2: Convert to fraction form
    19.22/28.80 = 18.45/x
  3. Step 3: Cross multiply
    19.22x = 28.80 × 18.45
  4. Step 4: Simplify right side
    19.22x = 531.36
  5. Step 5: Solve for x
    x = 531.36/19.22
  6. Step 6: Final answer
    x = 27.65

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