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Finding the Fourth Proportional to 228,769.92, 315,626.76 and 138,091.50

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Solution

The fourth proportional to 228,769.92, 315,626.76 and 138,091.50 is: 190,520.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,769.92 : 315,626.76 = 138,091.50 : x
  2. Step 2: Convert to fraction form
    228,769.92/315,626.76 = 138,091.50/x
  3. Step 3: Cross multiply
    228,769.92x = 315,626.76 × 138,091.50
  4. Step 4: Simplify right side
    228,769.92x = 43,585,372,728.54
  5. Step 5: Solve for x
    x = 43,585,372,728.54/228,769.92
  6. Step 6: Final answer
    x = 190,520.56

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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.