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Finding the Fourth Proportional to 892.23, 1,231.28 and 493.92

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Solution

The fourth proportional to 892.23, 1,231.28 and 493.92 is: 681.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.23 : 1,231.28 = 493.92 : x
  2. Step 2: Convert to fraction form
    892.23/1,231.28 = 493.92/x
  3. Step 3: Cross multiply
    892.23x = 1,231.28 × 493.92
  4. Step 4: Simplify right side
    892.23x = 608,151.35
  5. Step 5: Solve for x
    x = 608,151.35/892.23
  6. Step 6: Final answer
    x = 681.61

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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.