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Finding the Fourth Proportional to 78.62, 117.99 and 48.09

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Solution

The fourth proportional to 78.62, 117.99 and 48.09 is: 72.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.62 : 117.99 = 48.09 : x
  2. Step 2: Convert to fraction form
    78.62/117.99 = 48.09/x
  3. Step 3: Cross multiply
    78.62x = 117.99 × 48.09
  4. Step 4: Simplify right side
    78.62x = 5,674.14
  5. Step 5: Solve for x
    x = 5,674.14/78.62
  6. Step 6: Final answer
    x = 72.17

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