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Finding the Fourth Proportional to 709.08, 978.60 and 447

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Solution

The fourth proportional to 709.08, 978.60 and 447 is: 616.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.08 : 978.60 = 447 : x
  2. Step 2: Convert to fraction form
    709.08/978.60 = 447/x
  3. Step 3: Cross multiply
    709.08x = 978.60 × 447
  4. Step 4: Simplify right side
    709.08x = 437,434.20
  5. Step 5: Solve for x
    x = 437,434.20/709.08
  6. Step 6: Final answer
    x = 616.90

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