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Finding the Fourth Proportional to 828.22, 1,242.33 and 443.47

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Solution

The fourth proportional to 828.22, 1,242.33 and 443.47 is: 665.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.22 : 1,242.33 = 443.47 : x
  2. Step 2: Convert to fraction form
    828.22/1,242.33 = 443.47/x
  3. Step 3: Cross multiply
    828.22x = 1,242.33 × 443.47
  4. Step 4: Simplify right side
    828.22x = 550,936.09
  5. Step 5: Solve for x
    x = 550,936.09/828.22
  6. Step 6: Final answer
    x = 665.21

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Double scale
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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.