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Finding the Fourth Proportional to 827.28, 1,240.92 and 443.28

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Solution

The fourth proportional to 827.28, 1,240.92 and 443.28 is: 664.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.28 : 1,240.92 = 443.28 : x
  2. Step 2: Convert to fraction form
    827.28/1,240.92 = 443.28/x
  3. Step 3: Cross multiply
    827.28x = 1,240.92 × 443.28
  4. Step 4: Simplify right side
    827.28x = 550,075.02
  5. Step 5: Solve for x
    x = 550,075.02/827.28
  6. Step 6: Final answer
    x = 664.92

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Double scale
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1.5x scale

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.