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Finding the Fourth Proportional to 78.04, 107.70 and 68.32

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Solution

The fourth proportional to 78.04, 107.70 and 68.32 is: 94.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.04 : 107.70 = 68.32 : x
  2. Step 2: Convert to fraction form
    78.04/107.70 = 68.32/x
  3. Step 3: Cross multiply
    78.04x = 107.70 × 68.32
  4. Step 4: Simplify right side
    78.04x = 7,358.06
  5. Step 5: Solve for x
    x = 7,358.06/78.04
  6. Step 6: Final answer
    x = 94.29

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