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Finding the Fourth Proportional to 128,470.95, 192,761.56 and 49,640.54

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Solution

The fourth proportional to 128,470.95, 192,761.56 and 49,640.54 is: 74,482.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,470.95 : 192,761.56 = 49,640.54 : x
  2. Step 2: Convert to fraction form
    128,470.95/192,761.56 = 49,640.54/x
  3. Step 3: Cross multiply
    128,470.95x = 192,761.56 × 49,640.54
  4. Step 4: Simplify right side
    128,470.95x = 9,568,786,717.63
  5. Step 5: Solve for x
    x = 9,568,786,717.63/128,470.95
  6. Step 6: Final answer
    x = 74,482.10

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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.