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Finding the Fourth Proportional to 828.92, 1,143.90 and 455.91

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Solution

The fourth proportional to 828.92, 1,143.90 and 455.91 is: 629.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.92 : 1,143.90 = 455.91 : x
  2. Step 2: Convert to fraction form
    828.92/1,143.90 = 455.91/x
  3. Step 3: Cross multiply
    828.92x = 1,143.90 × 455.91
  4. Step 4: Simplify right side
    828.92x = 521,511.16
  5. Step 5: Solve for x
    x = 521,511.16/828.92
  6. Step 6: Final answer
    x = 629.14

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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.