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Finding the Fourth Proportional to 1,321.47, 1,982.22 and 628.21

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Solution

The fourth proportional to 1,321.47, 1,982.22 and 628.21 is: 942.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.47 : 1,982.22 = 628.21 : x
  2. Step 2: Convert to fraction form
    1,321.47/1,982.22 = 628.21/x
  3. Step 3: Cross multiply
    1,321.47x = 1,982.22 × 628.21
  4. Step 4: Simplify right side
    1,321.47x = 1,245,240.52
  5. Step 5: Solve for x
    x = 1,245,240.52/1,321.47
  6. Step 6: Final answer
    x = 942.32

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1.5x scale

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.