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Finding the Fourth Proportional to 1,321.22, 1,982.10 and 455.42

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Solution

The fourth proportional to 1,321.22, 1,982.10 and 455.42 is: 683.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.22 : 1,982.10 = 455.42 : x
  2. Step 2: Convert to fraction form
    1,321.22/1,982.10 = 455.42/x
  3. Step 3: Cross multiply
    1,321.22x = 1,982.10 × 455.42
  4. Step 4: Simplify right side
    1,321.22x = 902,687.98
  5. Step 5: Solve for x
    x = 902,687.98/1,321.22
  6. Step 6: Final answer
    x = 683.22

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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.