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Finding the Fourth Proportional to 828.53, 1,143.38 and 455.54

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Solution

The fourth proportional to 828.53, 1,143.38 and 455.54 is: 628.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.53 : 1,143.38 = 455.54 : x
  2. Step 2: Convert to fraction form
    828.53/1,143.38 = 455.54/x
  3. Step 3: Cross multiply
    828.53x = 1,143.38 × 455.54
  4. Step 4: Simplify right side
    828.53x = 520,847.33
  5. Step 5: Solve for x
    x = 520,847.33/828.53
  6. Step 6: Final answer
    x = 628.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.