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Finding the Fourth Proportional to 662.40, 993.28 and 278.08

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Solution

The fourth proportional to 662.40, 993.28 and 278.08 is: 416.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.40 : 993.28 = 278.08 : x
  2. Step 2: Convert to fraction form
    662.40/993.28 = 278.08/x
  3. Step 3: Cross multiply
    662.40x = 993.28 × 278.08
  4. Step 4: Simplify right side
    662.40x = 276,211.30
  5. Step 5: Solve for x
    x = 276,211.30/662.40
  6. Step 6: Final answer
    x = 416.99

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