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Finding the Fourth Proportional to 823.99, 1,236.24 and 515.41

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Solution

The fourth proportional to 823.99, 1,236.24 and 515.41 is: 773.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.99 : 1,236.24 = 515.41 : x
  2. Step 2: Convert to fraction form
    823.99/1,236.24 = 515.41/x
  3. Step 3: Cross multiply
    823.99x = 1,236.24 × 515.41
  4. Step 4: Simplify right side
    823.99x = 637,167.88
  5. Step 5: Solve for x
    x = 637,167.88/823.99
  6. Step 6: Final answer
    x = 773.28

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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.