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Finding the Fourth Proportional to 128,418.56, 192,660.70 and 75,155.39

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Solution

The fourth proportional to 128,418.56, 192,660.70 and 75,155.39 is: 112,752.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,418.56 : 192,660.70 = 75,155.39 : x
  2. Step 2: Convert to fraction form
    128,418.56/192,660.70 = 75,155.39/x
  3. Step 3: Cross multiply
    128,418.56x = 192,660.70 × 75,155.39
  4. Step 4: Simplify right side
    128,418.56x = 14,479,488,894.98
  5. Step 5: Solve for x
    x = 14,479,488,894.98/128,418.56
  6. Step 6: Final answer
    x = 112,752.31

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1.5x scale

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.