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Finding the Fourth Proportional to 28,918.60, 43,379.90 and 12,276.68

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Solution

The fourth proportional to 28,918.60, 43,379.90 and 12,276.68 is: 18,415.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,918.60 : 43,379.90 = 12,276.68 : x
  2. Step 2: Convert to fraction form
    28,918.60/43,379.90 = 12,276.68/x
  3. Step 3: Cross multiply
    28,918.60x = 43,379.90 × 12,276.68
  4. Step 4: Simplify right side
    28,918.60x = 532,561,150.73
  5. Step 5: Solve for x
    x = 532,561,150.73/28,918.60
  6. Step 6: Final answer
    x = 18,415.87

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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.