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Finding the Fourth Proportional to 1,317.81, 1,978.53 and 669

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Solution

The fourth proportional to 1,317.81, 1,978.53 and 669 is: 1,004.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.81 : 1,978.53 = 669 : x
  2. Step 2: Convert to fraction form
    1,317.81/1,978.53 = 669/x
  3. Step 3: Cross multiply
    1,317.81x = 1,978.53 × 669
  4. Step 4: Simplify right side
    1,317.81x = 1,323,636.57
  5. Step 5: Solve for x
    x = 1,323,636.57/1,317.81
  6. Step 6: Final answer
    x = 1,004.42

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