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Finding the Fourth Proportional to 692.72, 955.96 and 398

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Solution

The fourth proportional to 692.72, 955.96 and 398 is: 549.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.72 : 955.96 = 398 : x
  2. Step 2: Convert to fraction form
    692.72/955.96 = 398/x
  3. Step 3: Cross multiply
    692.72x = 955.96 × 398
  4. Step 4: Simplify right side
    692.72x = 380,472.08
  5. Step 5: Solve for x
    x = 380,472.08/692.72
  6. Step 6: Final answer
    x = 549.24

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