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Finding the Fourth Proportional to 1,321.69, 1,982.74 and 628.43

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Solution

The fourth proportional to 1,321.69, 1,982.74 and 628.43 is: 942.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.69 : 1,982.74 = 628.43 : x
  2. Step 2: Convert to fraction form
    1,321.69/1,982.74 = 628.43/x
  3. Step 3: Cross multiply
    1,321.69x = 1,982.74 × 628.43
  4. Step 4: Simplify right side
    1,321.69x = 1,246,013.30
  5. Step 5: Solve for x
    x = 1,246,013.30/1,321.69
  6. Step 6: Final answer
    x = 942.74

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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.