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Finding the Fourth Proportional to 827.14, 1,240.43 and 388.25

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Solution

The fourth proportional to 827.14, 1,240.43 and 388.25 is: 582.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.14 : 1,240.43 = 388.25 : x
  2. Step 2: Convert to fraction form
    827.14/1,240.43 = 388.25/x
  3. Step 3: Cross multiply
    827.14x = 1,240.43 × 388.25
  4. Step 4: Simplify right side
    827.14x = 481,598.11
  5. Step 5: Solve for x
    x = 481,598.11/827.14
  6. Step 6: Final answer
    x = 582.25

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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.