Home / 129,218.96-178,321.20-72,630.56

Finding the Fourth Proportional to 129,218.96, 178,321.20 and 72,630.56

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Solution

The fourth proportional to 129,218.96, 178,321.20 and 72,630.56 is: 100,229.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,218.96 : 178,321.20 = 72,630.56 : x
  2. Step 2: Convert to fraction form
    129,218.96/178,321.20 = 72,630.56/x
  3. Step 3: Cross multiply
    129,218.96x = 178,321.20 × 72,630.56
  4. Step 4: Simplify right side
    129,218.96x = 12,951,568,615.87
  5. Step 5: Solve for x
    x = 12,951,568,615.87/129,218.96
  6. Step 6: Final answer
    x = 100,229.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.