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Finding the Fourth Proportional to 128,360.79, 192,470.06 and 52,512.59

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Solution

The fourth proportional to 128,360.79, 192,470.06 and 52,512.59 is: 78,739.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,360.79 : 192,470.06 = 52,512.59 : x
  2. Step 2: Convert to fraction form
    128,360.79/192,470.06 = 52,512.59/x
  3. Step 3: Cross multiply
    128,360.79x = 192,470.06 × 52,512.59
  4. Step 4: Simplify right side
    128,360.79x = 10,107,100,123.14
  5. Step 5: Solve for x
    x = 10,107,100,123.14/128,360.79
  6. Step 6: Final answer
    x = 78,739.78

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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.