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Finding the Fourth Proportional to 90,608.20, 135,912.30 and 83,609.80

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Solution

The fourth proportional to 90,608.20, 135,912.30 and 83,609.80 is: 125,414.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,608.20 : 135,912.30 = 83,609.80 : x
  2. Step 2: Convert to fraction form
    90,608.20/135,912.30 = 83,609.80/x
  3. Step 3: Cross multiply
    90,608.20x = 135,912.30 × 83,609.80
  4. Step 4: Simplify right side
    90,608.20x = 11,363,600,220.54
  5. Step 5: Solve for x
    x = 11,363,600,220.54/90,608.20
  6. Step 6: Final answer
    x = 125,414.70

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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.