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Finding the Fourth Proportional to 53.31, 79.97 and 21.25

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Solution

The fourth proportional to 53.31, 79.97 and 21.25 is: 31.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.31 : 79.97 = 21.25 : x
  2. Step 2: Convert to fraction form
    53.31/79.97 = 21.25/x
  3. Step 3: Cross multiply
    53.31x = 79.97 × 21.25
  4. Step 4: Simplify right side
    53.31x = 1,699.36
  5. Step 5: Solve for x
    x = 1,699.36/53.31
  6. Step 6: Final answer
    x = 31.88

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