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Finding the Fourth Proportional to 819.62, 1,229.80 and 306.50

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Solution

The fourth proportional to 819.62, 1,229.80 and 306.50 is: 459.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.62 : 1,229.80 = 306.50 : x
  2. Step 2: Convert to fraction form
    819.62/1,229.80 = 306.50/x
  3. Step 3: Cross multiply
    819.62x = 1,229.80 × 306.50
  4. Step 4: Simplify right side
    819.62x = 376,933.70
  5. Step 5: Solve for x
    x = 376,933.70/819.62
  6. Step 6: Final answer
    x = 459.89

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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.