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Finding the Fourth Proportional to 18,961.86, 28,443.20 and 5,813.94

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Solution

The fourth proportional to 18,961.86, 28,443.20 and 5,813.94 is: 8,721.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.86 : 28,443.20 = 5,813.94 : x
  2. Step 2: Convert to fraction form
    18,961.86/28,443.20 = 5,813.94/x
  3. Step 3: Cross multiply
    18,961.86x = 28,443.20 × 5,813.94
  4. Step 4: Simplify right side
    18,961.86x = 165,367,058.21
  5. Step 5: Solve for x
    x = 165,367,058.21/18,961.86
  6. Step 6: Final answer
    x = 8,721.04

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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.