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Finding the Fourth Proportional to 827.40, 1,240.38 and 393.96

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Solution

The fourth proportional to 827.40, 1,240.38 and 393.96 is: 590.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.40 : 1,240.38 = 393.96 : x
  2. Step 2: Convert to fraction form
    827.40/1,240.38 = 393.96/x
  3. Step 3: Cross multiply
    827.40x = 1,240.38 × 393.96
  4. Step 4: Simplify right side
    827.40x = 488,660.10
  5. Step 5: Solve for x
    x = 488,660.10/827.40
  6. Step 6: Final answer
    x = 590.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.