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Finding the Fourth Proportional to 1,321.28, 1,980.54 and 443.12

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Solution

The fourth proportional to 1,321.28, 1,980.54 and 443.12 is: 664.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.28 : 1,980.54 = 443.12 : x
  2. Step 2: Convert to fraction form
    1,321.28/1,980.54 = 443.12/x
  3. Step 3: Cross multiply
    1,321.28x = 1,980.54 × 443.12
  4. Step 4: Simplify right side
    1,321.28x = 877,606.98
  5. Step 5: Solve for x
    x = 877,606.98/1,321.28
  6. Step 6: Final answer
    x = 664.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.