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Finding the Fourth Proportional to 978, 1,467 and 328.74

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Solution

The fourth proportional to 978, 1,467 and 328.74 is: 493.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    978 : 1,467 = 328.74 : x
  2. Step 2: Convert to fraction form
    978/1,467 = 328.74/x
  3. Step 3: Cross multiply
    978x = 1,467 × 328.74
  4. Step 4: Simplify right side
    978x = 482,261.58
  5. Step 5: Solve for x
    x = 482,261.58/978
  6. Step 6: Final answer
    x = 493.11

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