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Finding the Fourth Proportional to 18,761.33, 28,139.82 and 4,911.41

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Solution

The fourth proportional to 18,761.33, 28,139.82 and 4,911.41 is: 7,366.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.33 : 28,139.82 = 4,911.41 : x
  2. Step 2: Convert to fraction form
    18,761.33/28,139.82 = 4,911.41/x
  3. Step 3: Cross multiply
    18,761.33x = 28,139.82 × 4,911.41
  4. Step 4: Simplify right side
    18,761.33x = 138,206,193.35
  5. Step 5: Solve for x
    x = 138,206,193.35/18,761.33
  6. Step 6: Final answer
    x = 7,366.55

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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.