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Finding the Fourth Proportional to 90,630.70, 135,738.97 and 43,278.96

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Solution

The fourth proportional to 90,630.70, 135,738.97 and 43,278.96 is: 64,819.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,630.70 : 135,738.97 = 43,278.96 : x
  2. Step 2: Convert to fraction form
    90,630.70/135,738.97 = 43,278.96/x
  3. Step 3: Cross multiply
    90,630.70x = 135,738.97 × 43,278.96
  4. Step 4: Simplify right side
    90,630.70x = 5,874,641,236.68
  5. Step 5: Solve for x
    x = 5,874,641,236.68/90,630.70
  6. Step 6: Final answer
    x = 64,819.55

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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.