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Finding the Fourth Proportional to 827.90, 1,142.54 and 454.91

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Solution

The fourth proportional to 827.90, 1,142.54 and 454.91 is: 627.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.90 : 1,142.54 = 454.91 : x
  2. Step 2: Convert to fraction form
    827.90/1,142.54 = 454.91/x
  3. Step 3: Cross multiply
    827.90x = 1,142.54 × 454.91
  4. Step 4: Simplify right side
    827.90x = 519,750.60
  5. Step 5: Solve for x
    x = 519,750.60/827.90
  6. Step 6: Final answer
    x = 627.79

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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.