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Finding the Fourth Proportional to 2,153.28, 2,971.50 and 1,221.72

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Solution

The fourth proportional to 2,153.28, 2,971.50 and 1,221.72 is: 1,685.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.28 : 2,971.50 = 1,221.72 : x
  2. Step 2: Convert to fraction form
    2,153.28/2,971.50 = 1,221.72/x
  3. Step 3: Cross multiply
    2,153.28x = 2,971.50 × 1,221.72
  4. Step 4: Simplify right side
    2,153.28x = 3,630,340.98
  5. Step 5: Solve for x
    x = 3,630,340.98/2,153.28
  6. Step 6: Final answer
    x = 1,685.96

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