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Finding the Fourth Proportional to 822.43, 1,135 and 490.87

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Solution

The fourth proportional to 822.43, 1,135 and 490.87 is: 677.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.43 : 1,135 = 490.87 : x
  2. Step 2: Convert to fraction form
    822.43/1,135 = 490.87/x
  3. Step 3: Cross multiply
    822.43x = 1,135 × 490.87
  4. Step 4: Simplify right side
    822.43x = 557,137.45
  5. Step 5: Solve for x
    x = 557,137.45/822.43
  6. Step 6: Final answer
    x = 677.43

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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.