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Finding the Fourth Proportional to 827.82, 1,142.39 and 454.80

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Solution

The fourth proportional to 827.82, 1,142.39 and 454.80 is: 627.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.82 : 1,142.39 = 454.80 : x
  2. Step 2: Convert to fraction form
    827.82/1,142.39 = 454.80/x
  3. Step 3: Cross multiply
    827.82x = 1,142.39 × 454.80
  4. Step 4: Simplify right side
    827.82x = 519,558.97
  5. Step 5: Solve for x
    x = 519,558.97/827.82
  6. Step 6: Final answer
    x = 627.62

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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.