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Finding the Fourth Proportional to 892.20, 1,231.26 and 499.20

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Solution

The fourth proportional to 892.20, 1,231.26 and 499.20 is: 688.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.20 : 1,231.26 = 499.20 : x
  2. Step 2: Convert to fraction form
    892.20/1,231.26 = 499.20/x
  3. Step 3: Cross multiply
    892.20x = 1,231.26 × 499.20
  4. Step 4: Simplify right side
    892.20x = 614,644.99
  5. Step 5: Solve for x
    x = 614,644.99/892.20
  6. Step 6: Final answer
    x = 688.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.