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Finding the Fourth Proportional to 828.30, 1,143.06 and 455.27

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Solution

The fourth proportional to 828.30, 1,143.06 and 455.27 is: 628.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.30 : 1,143.06 = 455.27 : x
  2. Step 2: Convert to fraction form
    828.30/1,143.06 = 455.27/x
  3. Step 3: Cross multiply
    828.30x = 1,143.06 × 455.27
  4. Step 4: Simplify right side
    828.30x = 520,395.21
  5. Step 5: Solve for x
    x = 520,395.21/828.30
  6. Step 6: Final answer
    x = 628.27

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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.