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Finding the Fourth Proportional to 1,724.82, 2,380.10 and 978.81

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Solution

The fourth proportional to 1,724.82, 2,380.10 and 978.81 is: 1,350.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,724.82 : 2,380.10 = 978.81 : x
  2. Step 2: Convert to fraction form
    1,724.82/2,380.10 = 978.81/x
  3. Step 3: Cross multiply
    1,724.82x = 2,380.10 × 978.81
  4. Step 4: Simplify right side
    1,724.82x = 2,329,660.79
  5. Step 5: Solve for x
    x = 2,329,660.79/1,724.82
  6. Step 6: Final answer
    x = 1,350.67

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