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Finding the Fourth Proportional to 20,978.52, 31,473.30 and 10,451.64

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Solution

The fourth proportional to 20,978.52, 31,473.30 and 10,451.64 is: 15,680.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.52 : 31,473.30 = 10,451.64 : x
  2. Step 2: Convert to fraction form
    20,978.52/31,473.30 = 10,451.64/x
  3. Step 3: Cross multiply
    20,978.52x = 31,473.30 × 10,451.64
  4. Step 4: Simplify right side
    20,978.52x = 328,947,601.21
  5. Step 5: Solve for x
    x = 328,947,601.21/20,978.52
  6. Step 6: Final answer
    x = 15,680.21

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