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Finding the Fourth Proportional to 18,978.89, 28,469.37 and 7,886.70

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Solution

The fourth proportional to 18,978.89, 28,469.37 and 7,886.70 is: 11,830.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.89 : 28,469.37 = 7,886.70 : x
  2. Step 2: Convert to fraction form
    18,978.89/28,469.37 = 7,886.70/x
  3. Step 3: Cross multiply
    18,978.89x = 28,469.37 × 7,886.70
  4. Step 4: Simplify right side
    18,978.89x = 224,529,380.38
  5. Step 5: Solve for x
    x = 224,529,380.38/18,978.89
  6. Step 6: Final answer
    x = 11,830.48

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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.