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Finding the Fourth Proportional to 186.71, 280.16 and 78.47

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Solution

The fourth proportional to 186.71, 280.16 and 78.47 is: 117.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.71 : 280.16 = 78.47 : x
  2. Step 2: Convert to fraction form
    186.71/280.16 = 78.47/x
  3. Step 3: Cross multiply
    186.71x = 280.16 × 78.47
  4. Step 4: Simplify right side
    186.71x = 21,983.71
  5. Step 5: Solve for x
    x = 21,983.71/186.71
  6. Step 6: Final answer
    x = 117.75

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