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Finding the Fourth Proportional to 3,128.43, 4,692.54 and 819.93

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Solution

The fourth proportional to 3,128.43, 4,692.54 and 819.93 is: 1,229.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.43 : 4,692.54 = 819.93 : x
  2. Step 2: Convert to fraction form
    3,128.43/4,692.54 = 819.93/x
  3. Step 3: Cross multiply
    3,128.43x = 4,692.54 × 819.93
  4. Step 4: Simplify right side
    3,128.43x = 3,847,554.32
  5. Step 5: Solve for x
    x = 3,847,554.32/3,128.43
  6. Step 6: Final answer
    x = 1,229.87

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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.