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Finding the Fourth Proportional to 827.80, 1,240.26 and 682.36

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Solution

The fourth proportional to 827.80, 1,240.26 and 682.36 is: 1,022.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.80 : 1,240.26 = 682.36 : x
  2. Step 2: Convert to fraction form
    827.80/1,240.26 = 682.36/x
  3. Step 3: Cross multiply
    827.80x = 1,240.26 × 682.36
  4. Step 4: Simplify right side
    827.80x = 846,303.81
  5. Step 5: Solve for x
    x = 846,303.81/827.80
  6. Step 6: Final answer
    x = 1,022.35

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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.