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Finding the Fourth Proportional to 828.92, 1,243.66 and 281.14

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Solution

The fourth proportional to 828.92, 1,243.66 and 281.14 is: 421.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.92 : 1,243.66 = 281.14 : x
  2. Step 2: Convert to fraction form
    828.92/1,243.66 = 281.14/x
  3. Step 3: Cross multiply
    828.92x = 1,243.66 × 281.14
  4. Step 4: Simplify right side
    828.92x = 349,642.57
  5. Step 5: Solve for x
    x = 349,642.57/828.92
  6. Step 6: Final answer
    x = 421.80

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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.