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Finding the Fourth Proportional to 827.28, 1,240.20 and 416.07

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Solution

The fourth proportional to 827.28, 1,240.20 and 416.07 is: 623.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.28 : 1,240.20 = 416.07 : x
  2. Step 2: Convert to fraction form
    827.28/1,240.20 = 416.07/x
  3. Step 3: Cross multiply
    827.28x = 1,240.20 × 416.07
  4. Step 4: Simplify right side
    827.28x = 516,010.01
  5. Step 5: Solve for x
    x = 516,010.01/827.28
  6. Step 6: Final answer
    x = 623.74

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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.