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Finding the Fourth Proportional to 827.30, 1,240.75 and 279.34

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Solution

The fourth proportional to 827.30, 1,240.75 and 279.34 is: 418.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.30 : 1,240.75 = 279.34 : x
  2. Step 2: Convert to fraction form
    827.30/1,240.75 = 279.34/x
  3. Step 3: Cross multiply
    827.30x = 1,240.75 × 279.34
  4. Step 4: Simplify right side
    827.30x = 346,591.11
  5. Step 5: Solve for x
    x = 346,591.11/827.30
  6. Step 6: Final answer
    x = 418.94

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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.