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Finding the Fourth Proportional to 140.13, 210.24 and 71.64

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Solution

The fourth proportional to 140.13, 210.24 and 71.64 is: 107.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.13 : 210.24 = 71.64 : x
  2. Step 2: Convert to fraction form
    140.13/210.24 = 71.64/x
  3. Step 3: Cross multiply
    140.13x = 210.24 × 71.64
  4. Step 4: Simplify right side
    140.13x = 15,061.59
  5. Step 5: Solve for x
    x = 15,061.59/140.13
  6. Step 6: Final answer
    x = 107.48

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