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Finding the Fourth Proportional to 828.05, 1,240.67 and 519.22

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Solution

The fourth proportional to 828.05, 1,240.67 and 519.22 is: 777.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.05 : 1,240.67 = 519.22 : x
  2. Step 2: Convert to fraction form
    828.05/1,240.67 = 519.22/x
  3. Step 3: Cross multiply
    828.05x = 1,240.67 × 519.22
  4. Step 4: Simplify right side
    828.05x = 644,174.47
  5. Step 5: Solve for x
    x = 644,174.47/828.05
  6. Step 6: Final answer
    x = 777.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.