Home / 18,939.60-28,385.64-11,129.04

Finding the Fourth Proportional to 18,939.60, 28,385.64 and 11,129.04

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Solution

The fourth proportional to 18,939.60, 28,385.64 and 11,129.04 is: 16,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.60 : 28,385.64 = 11,129.04 : x
  2. Step 2: Convert to fraction form
    18,939.60/28,385.64 = 11,129.04/x
  3. Step 3: Cross multiply
    18,939.60x = 28,385.64 × 11,129.04
  4. Step 4: Simplify right side
    18,939.60x = 315,904,922.99
  5. Step 5: Solve for x
    x = 315,904,922.99/18,939.60
  6. Step 6: Final answer
    x = 16,679.60

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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.