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Finding the Fourth Proportional to 129,229.20, 193,843.80 and 66,918.80

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Solution

The fourth proportional to 129,229.20, 193,843.80 and 66,918.80 is: 100,378.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,229.20 : 193,843.80 = 66,918.80 : x
  2. Step 2: Convert to fraction form
    129,229.20/193,843.80 = 66,918.80/x
  3. Step 3: Cross multiply
    129,229.20x = 193,843.80 × 66,918.80
  4. Step 4: Simplify right side
    129,229.20x = 12,971,794,483.44
  5. Step 5: Solve for x
    x = 12,971,794,483.44/129,229.20
  6. Step 6: Final answer
    x = 100,378.20

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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.