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Finding the Fourth Proportional to 819.35, 1,228.72 and 299.18

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Solution

The fourth proportional to 819.35, 1,228.72 and 299.18 is: 448.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.35 : 1,228.72 = 299.18 : x
  2. Step 2: Convert to fraction form
    819.35/1,228.72 = 299.18/x
  3. Step 3: Cross multiply
    819.35x = 1,228.72 × 299.18
  4. Step 4: Simplify right side
    819.35x = 367,608.45
  5. Step 5: Solve for x
    x = 367,608.45/819.35
  6. Step 6: Final answer
    x = 448.66

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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.