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Finding the Fourth Proportional to 128,470.60, 192,734.70 and 39,728.20

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Solution

The fourth proportional to 128,470.60, 192,734.70 and 39,728.20 is: 59,601.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,470.60 : 192,734.70 = 39,728.20 : x
  2. Step 2: Convert to fraction form
    128,470.60/192,734.70 = 39,728.20/x
  3. Step 3: Cross multiply
    128,470.60x = 192,734.70 × 39,728.20
  4. Step 4: Simplify right side
    128,470.60x = 7,657,002,708.54
  5. Step 5: Solve for x
    x = 7,657,002,708.54/128,470.60
  6. Step 6: Final answer
    x = 59,601.21

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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.