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Finding the Fourth Proportional to 663.56, 995.26 and 278.44

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Solution

The fourth proportional to 663.56, 995.26 and 278.44 is: 417.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.56 : 995.26 = 278.44 : x
  2. Step 2: Convert to fraction form
    663.56/995.26 = 278.44/x
  3. Step 3: Cross multiply
    663.56x = 995.26 × 278.44
  4. Step 4: Simplify right side
    663.56x = 277,120.19
  5. Step 5: Solve for x
    x = 277,120.19/663.56
  6. Step 6: Final answer
    x = 417.63

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