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Finding the Fourth Proportional to 128,512.78, 192,738.12 and 49,576.66

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Solution

The fourth proportional to 128,512.78, 192,738.12 and 49,576.66 is: 74,353.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.78 : 192,738.12 = 49,576.66 : x
  2. Step 2: Convert to fraction form
    128,512.78/192,738.12 = 49,576.66/x
  3. Step 3: Cross multiply
    128,512.78x = 192,738.12 × 49,576.66
  4. Step 4: Simplify right side
    128,512.78x = 9,555,312,244.28
  5. Step 5: Solve for x
    x = 9,555,312,244.28/128,512.78
  6. Step 6: Final answer
    x = 74,353.01

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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.