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Finding the Fourth Proportional to 820.38, 1,229.62 and 357.46

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Solution

The fourth proportional to 820.38, 1,229.62 and 357.46 is: 535.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.38 : 1,229.62 = 357.46 : x
  2. Step 2: Convert to fraction form
    820.38/1,229.62 = 357.46/x
  3. Step 3: Cross multiply
    820.38x = 1,229.62 × 357.46
  4. Step 4: Simplify right side
    820.38x = 439,539.97
  5. Step 5: Solve for x
    x = 439,539.97/820.38
  6. Step 6: Final answer
    x = 535.78

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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.