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Finding the Fourth Proportional to 827.94, 1,241.78 and 280.13

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Solution

The fourth proportional to 827.94, 1,241.78 and 280.13 is: 420.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.94 : 1,241.78 = 280.13 : x
  2. Step 2: Convert to fraction form
    827.94/1,241.78 = 280.13/x
  3. Step 3: Cross multiply
    827.94x = 1,241.78 × 280.13
  4. Step 4: Simplify right side
    827.94x = 347,852.22
  5. Step 5: Solve for x
    x = 347,852.22/827.94
  6. Step 6: Final answer
    x = 420.14

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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.