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Finding the Fourth Proportional to 1,608.36, 2,219.18 and 978.87

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Solution

The fourth proportional to 1,608.36, 2,219.18 and 978.87 is: 1,350.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.36 : 2,219.18 = 978.87 : x
  2. Step 2: Convert to fraction form
    1,608.36/2,219.18 = 978.87/x
  3. Step 3: Cross multiply
    1,608.36x = 2,219.18 × 978.87
  4. Step 4: Simplify right side
    1,608.36x = 2,172,283.83
  5. Step 5: Solve for x
    x = 2,172,283.83/1,608.36
  6. Step 6: Final answer
    x = 1,350.62

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