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Finding the Fourth Proportional to 206,819.70, 310,229.55 and 128,087.70

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Solution

The fourth proportional to 206,819.70, 310,229.55 and 128,087.70 is: 192,131.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,819.70 : 310,229.55 = 128,087.70 : x
  2. Step 2: Convert to fraction form
    206,819.70/310,229.55 = 128,087.70/x
  3. Step 3: Cross multiply
    206,819.70x = 310,229.55 × 128,087.70
  4. Step 4: Simplify right side
    206,819.70x = 39,736,589,531.54
  5. Step 5: Solve for x
    x = 39,736,589,531.54/206,819.70
  6. Step 6: Final answer
    x = 192,131.55

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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.