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Finding the Fourth Proportional to 28,892.80, 43,352.64 and 12,256.78

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Solution

The fourth proportional to 28,892.80, 43,352.64 and 12,256.78 is: 18,390.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,892.80 : 43,352.64 = 12,256.78 : x
  2. Step 2: Convert to fraction form
    28,892.80/43,352.64 = 12,256.78/x
  3. Step 3: Cross multiply
    28,892.80x = 43,352.64 × 12,256.78
  4. Step 4: Simplify right side
    28,892.80x = 531,363,770.90
  5. Step 5: Solve for x
    x = 531,363,770.90/28,892.80
  6. Step 6: Final answer
    x = 18,390.87

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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.