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Finding the Fourth Proportional to 830.43, 1,245.02 and 505.44

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Solution

The fourth proportional to 830.43, 1,245.02 and 505.44 is: 757.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.43 : 1,245.02 = 505.44 : x
  2. Step 2: Convert to fraction form
    830.43/1,245.02 = 505.44/x
  3. Step 3: Cross multiply
    830.43x = 1,245.02 × 505.44
  4. Step 4: Simplify right side
    830.43x = 629,280.38
  5. Step 5: Solve for x
    x = 629,280.38/830.43
  6. Step 6: Final answer
    x = 757.78

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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.