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Finding the Fourth Proportional to 819.56, 1,228.42 and 434.04

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Solution

The fourth proportional to 819.56, 1,228.42 and 434.04 is: 650.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.56 : 1,228.42 = 434.04 : x
  2. Step 2: Convert to fraction form
    819.56/1,228.42 = 434.04/x
  3. Step 3: Cross multiply
    819.56x = 1,228.42 × 434.04
  4. Step 4: Simplify right side
    819.56x = 533,183.42
  5. Step 5: Solve for x
    x = 533,183.42/819.56
  6. Step 6: Final answer
    x = 650.57

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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.