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Finding the Fourth Proportional to 827.32, 1,142.38 and 640.49

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Solution

The fourth proportional to 827.32, 1,142.38 and 640.49 is: 884.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.32 : 1,142.38 = 640.49 : x
  2. Step 2: Convert to fraction form
    827.32/1,142.38 = 640.49/x
  3. Step 3: Cross multiply
    827.32x = 1,142.38 × 640.49
  4. Step 4: Simplify right side
    827.32x = 731,682.68
  5. Step 5: Solve for x
    x = 731,682.68/827.32
  6. Step 6: Final answer
    x = 884.40

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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.