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Finding the Fourth Proportional to 29,679.60, 44,503.20 and 12,129.60

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Solution

The fourth proportional to 29,679.60, 44,503.20 and 12,129.60 is: 18,187.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,679.60 : 44,503.20 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    29,679.60/44,503.20 = 12,129.60/x
  3. Step 3: Cross multiply
    29,679.60x = 44,503.20 × 12,129.60
  4. Step 4: Simplify right side
    29,679.60x = 539,806,014.72
  5. Step 5: Solve for x
    x = 539,806,014.72/29,679.60
  6. Step 6: Final answer
    x = 18,187.78

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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.