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Finding the Fourth Proportional to 892.51, 1,231.87 and 519.70

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Solution

The fourth proportional to 892.51, 1,231.87 and 519.70 is: 717.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.51 : 1,231.87 = 519.70 : x
  2. Step 2: Convert to fraction form
    892.51/1,231.87 = 519.70/x
  3. Step 3: Cross multiply
    892.51x = 1,231.87 × 519.70
  4. Step 4: Simplify right side
    892.51x = 640,202.84
  5. Step 5: Solve for x
    x = 640,202.84/892.51
  6. Step 6: Final answer
    x = 717.31

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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.