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Finding the Fourth Proportional to 892.56, 1,231.72 and 519.67

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Solution

The fourth proportional to 892.56, 1,231.72 and 519.67 is: 717.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.56 : 1,231.72 = 519.67 : x
  2. Step 2: Convert to fraction form
    892.56/1,231.72 = 519.67/x
  3. Step 3: Cross multiply
    892.56x = 1,231.72 × 519.67
  4. Step 4: Simplify right side
    892.56x = 640,087.93
  5. Step 5: Solve for x
    x = 640,087.93/892.56
  6. Step 6: Final answer
    x = 717.14

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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.