Home / 128,516.20-177,227.94-100,211.56

Finding the Fourth Proportional to 128,516.20, 177,227.94 and 100,211.56

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Solution

The fourth proportional to 128,516.20, 177,227.94 and 100,211.56 is: 138,194.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,516.20 : 177,227.94 = 100,211.56 : x
  2. Step 2: Convert to fraction form
    128,516.20/177,227.94 = 100,211.56/x
  3. Step 3: Cross multiply
    128,516.20x = 177,227.94 × 100,211.56
  4. Step 4: Simplify right side
    128,516.20x = 17,760,288,342.99
  5. Step 5: Solve for x
    x = 17,760,288,342.99/128,516.20
  6. Step 6: Final answer
    x = 138,194.94

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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.