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Finding the Fourth Proportional to 827.71, 1,241.39 and 279.88

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Solution

The fourth proportional to 827.71, 1,241.39 and 279.88 is: 419.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.71 : 1,241.39 = 279.88 : x
  2. Step 2: Convert to fraction form
    827.71/1,241.39 = 279.88/x
  3. Step 3: Cross multiply
    827.71x = 1,241.39 × 279.88
  4. Step 4: Simplify right side
    827.71x = 347,437.83
  5. Step 5: Solve for x
    x = 347,437.83/827.71
  6. Step 6: Final answer
    x = 419.76

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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.