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Finding the Fourth Proportional to 827.40, 1,238.67 and 611.94

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Solution

The fourth proportional to 827.40, 1,238.67 and 611.94 is: 916.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.40 : 1,238.67 = 611.94 : x
  2. Step 2: Convert to fraction form
    827.40/1,238.67 = 611.94/x
  3. Step 3: Cross multiply
    827.40x = 1,238.67 × 611.94
  4. Step 4: Simplify right side
    827.40x = 757,991.72
  5. Step 5: Solve for x
    x = 757,991.72/827.40
  6. Step 6: Final answer
    x = 916.11

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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.