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Finding the Fourth Proportional to 18,961.44, 28,456.68 and 8,580.48

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Solution

The fourth proportional to 18,961.44, 28,456.68 and 8,580.48 is: 12,877.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.44 : 28,456.68 = 8,580.48 : x
  2. Step 2: Convert to fraction form
    18,961.44/28,456.68 = 8,580.48/x
  3. Step 3: Cross multiply
    18,961.44x = 28,456.68 × 8,580.48
  4. Step 4: Simplify right side
    18,961.44x = 244,171,973.61
  5. Step 5: Solve for x
    x = 244,171,973.61/18,961.44
  6. Step 6: Final answer
    x = 12,877.29

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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.