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Finding the Fourth Proportional to 281.13, 421.71 and 75.72

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Solution

The fourth proportional to 281.13, 421.71 and 75.72 is: 113.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.13 : 421.71 = 75.72 : x
  2. Step 2: Convert to fraction form
    281.13/421.71 = 75.72/x
  3. Step 3: Cross multiply
    281.13x = 421.71 × 75.72
  4. Step 4: Simplify right side
    281.13x = 31,931.88
  5. Step 5: Solve for x
    x = 31,931.88/281.13
  6. Step 6: Final answer
    x = 113.58

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