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Finding the Fourth Proportional to 828.88, 1,243.74 and 520.68

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Solution

The fourth proportional to 828.88, 1,243.74 and 520.68 is: 781.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.88 : 1,243.74 = 520.68 : x
  2. Step 2: Convert to fraction form
    828.88/1,243.74 = 520.68/x
  3. Step 3: Cross multiply
    828.88x = 1,243.74 × 520.68
  4. Step 4: Simplify right side
    828.88x = 647,590.54
  5. Step 5: Solve for x
    x = 647,590.54/828.88
  6. Step 6: Final answer
    x = 781.28

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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.