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Finding the Fourth Proportional to 828.46, 1,143.29 and 455.47

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Solution

The fourth proportional to 828.46, 1,143.29 and 455.47 is: 628.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.46 : 1,143.29 = 455.47 : x
  2. Step 2: Convert to fraction form
    828.46/1,143.29 = 455.47/x
  3. Step 3: Cross multiply
    828.46x = 1,143.29 × 455.47
  4. Step 4: Simplify right side
    828.46x = 520,734.30
  5. Step 5: Solve for x
    x = 520,734.30/828.46
  6. Step 6: Final answer
    x = 628.56

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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.