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Finding the Fourth Proportional to 78,819.60, 118,229.40 and 74,542.80

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Solution

The fourth proportional to 78,819.60, 118,229.40 and 74,542.80 is: 111,814.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,819.60 : 118,229.40 = 74,542.80 : x
  2. Step 2: Convert to fraction form
    78,819.60/118,229.40 = 74,542.80/x
  3. Step 3: Cross multiply
    78,819.60x = 118,229.40 × 74,542.80
  4. Step 4: Simplify right side
    78,819.60x = 8,813,150,518.32
  5. Step 5: Solve for x
    x = 8,813,150,518.32/78,819.60
  6. Step 6: Final answer
    x = 111,814.20

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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.