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Finding the Fourth Proportional to 892.40, 1,231.08 and 629.84

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Solution

The fourth proportional to 892.40, 1,231.08 and 629.84 is: 868.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.40 : 1,231.08 = 629.84 : x
  2. Step 2: Convert to fraction form
    892.40/1,231.08 = 629.84/x
  3. Step 3: Cross multiply
    892.40x = 1,231.08 × 629.84
  4. Step 4: Simplify right side
    892.40x = 775,383.43
  5. Step 5: Solve for x
    x = 775,383.43/892.40
  6. Step 6: Final answer
    x = 868.87

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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.