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Finding the Fourth Proportional to 74,820.60, 111,906.90 and 66,979.80

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Solution

The fourth proportional to 74,820.60, 111,906.90 and 66,979.80 is: 100,179.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,820.60 : 111,906.90 = 66,979.80 : x
  2. Step 2: Convert to fraction form
    74,820.60/111,906.90 = 66,979.80/x
  3. Step 3: Cross multiply
    74,820.60x = 111,906.90 × 66,979.80
  4. Step 4: Simplify right side
    74,820.60x = 7,495,501,780.62
  5. Step 5: Solve for x
    x = 7,495,501,780.62/74,820.60
  6. Step 6: Final answer
    x = 100,179.65

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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.