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Finding the Fourth Proportional to 663.88, 916 and 401.85

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Solution

The fourth proportional to 663.88, 916 and 401.85 is: 554.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.88 : 916 = 401.85 : x
  2. Step 2: Convert to fraction form
    663.88/916 = 401.85/x
  3. Step 3: Cross multiply
    663.88x = 916 × 401.85
  4. Step 4: Simplify right side
    663.88x = 368,094.60
  5. Step 5: Solve for x
    x = 368,094.60/663.88
  6. Step 6: Final answer
    x = 554.46

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