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Finding the Fourth Proportional to 11,893.10, 17,838.24 and 3,128.70

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Solution

The fourth proportional to 11,893.10, 17,838.24 and 3,128.70 is: 4,692.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,893.10 : 17,838.24 = 3,128.70 : x
  2. Step 2: Convert to fraction form
    11,893.10/17,838.24 = 3,128.70/x
  3. Step 3: Cross multiply
    11,893.10x = 17,838.24 × 3,128.70
  4. Step 4: Simplify right side
    11,893.10x = 55,810,501.49
  5. Step 5: Solve for x
    x = 55,810,501.49/11,893.10
  6. Step 6: Final answer
    x = 4,692.68

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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.