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Finding the Fourth Proportional to 709.54, 978 and 499.95

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Solution

The fourth proportional to 709.54, 978 and 499.95 is: 689.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.54 : 978 = 499.95 : x
  2. Step 2: Convert to fraction form
    709.54/978 = 499.95/x
  3. Step 3: Cross multiply
    709.54x = 978 × 499.95
  4. Step 4: Simplify right side
    709.54x = 488,951.10
  5. Step 5: Solve for x
    x = 488,951.10/709.54
  6. Step 6: Final answer
    x = 689.11

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