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Finding the Fourth Proportional to 85,879.60, 128,819.40 and 74,069.80

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Solution

The fourth proportional to 85,879.60, 128,819.40 and 74,069.80 is: 111,104.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,879.60 : 128,819.40 = 74,069.80 : x
  2. Step 2: Convert to fraction form
    85,879.60/128,819.40 = 74,069.80/x
  3. Step 3: Cross multiply
    85,879.60x = 128,819.40 × 74,069.80
  4. Step 4: Simplify right side
    85,879.60x = 9,541,627,194.12
  5. Step 5: Solve for x
    x = 9,541,627,194.12/85,879.60
  6. Step 6: Final answer
    x = 111,104.70

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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.