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Finding the Fourth Proportional to 120,800.10, 181,200.15 and 85,370.70

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Solution

The fourth proportional to 120,800.10, 181,200.15 and 85,370.70 is: 128,056.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,800.10 : 181,200.15 = 85,370.70 : x
  2. Step 2: Convert to fraction form
    120,800.10/181,200.15 = 85,370.70/x
  3. Step 3: Cross multiply
    120,800.10x = 181,200.15 × 85,370.70
  4. Step 4: Simplify right side
    120,800.10x = 15,469,183,645.61
  5. Step 5: Solve for x
    x = 15,469,183,645.61/120,800.10
  6. Step 6: Final answer
    x = 128,056.05

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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.