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Finding the Fourth Proportional to 651.60, 978 and 327.20

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Solution

The fourth proportional to 651.60, 978 and 327.20 is: 491.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.60 : 978 = 327.20 : x
  2. Step 2: Convert to fraction form
    651.60/978 = 327.20/x
  3. Step 3: Cross multiply
    651.60x = 978 × 327.20
  4. Step 4: Simplify right side
    651.60x = 320,001.60
  5. Step 5: Solve for x
    x = 320,001.60/651.60
  6. Step 6: Final answer
    x = 491.10

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