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Finding the Fourth Proportional to 282.55, 423.81 and 128.65

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Solution

The fourth proportional to 282.55, 423.81 and 128.65 is: 192.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.55 : 423.81 = 128.65 : x
  2. Step 2: Convert to fraction form
    282.55/423.81 = 128.65/x
  3. Step 3: Cross multiply
    282.55x = 423.81 × 128.65
  4. Step 4: Simplify right side
    282.55x = 54,523.16
  5. Step 5: Solve for x
    x = 54,523.16/282.55
  6. Step 6: Final answer
    x = 192.97

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