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Finding the Fourth Proportional to 12,039.60, 18,059.40 and 9,879.60

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Solution

The fourth proportional to 12,039.60, 18,059.40 and 9,879.60 is: 14,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,039.60 : 18,059.40 = 9,879.60 : x
  2. Step 2: Convert to fraction form
    12,039.60/18,059.40 = 9,879.60/x
  3. Step 3: Cross multiply
    12,039.60x = 18,059.40 × 9,879.60
  4. Step 4: Simplify right side
    12,039.60x = 178,419,648.24
  5. Step 5: Solve for x
    x = 178,419,648.24/12,039.60
  6. Step 6: Final answer
    x = 14,819.40

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1.5x scale

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.