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Finding the Fourth Proportional to 829.88, 1,245.24 and 521.68

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Solution

The fourth proportional to 829.88, 1,245.24 and 521.68 is: 782.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.88 : 1,245.24 = 521.68 : x
  2. Step 2: Convert to fraction form
    829.88/1,245.24 = 521.68/x
  3. Step 3: Cross multiply
    829.88x = 1,245.24 × 521.68
  4. Step 4: Simplify right side
    829.88x = 649,616.80
  5. Step 5: Solve for x
    x = 649,616.80/829.88
  6. Step 6: Final answer
    x = 782.78

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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.