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Finding the Fourth Proportional to 128,493.31, 192,738.84 and 100,436.95

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Solution

The fourth proportional to 128,493.31, 192,738.84 and 100,436.95 is: 150,654.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,493.31 : 192,738.84 = 100,436.95 : x
  2. Step 2: Convert to fraction form
    128,493.31/192,738.84 = 100,436.95/x
  3. Step 3: Cross multiply
    128,493.31x = 192,738.84 × 100,436.95
  4. Step 4: Simplify right side
    128,493.31x = 19,358,101,236.14
  5. Step 5: Solve for x
    x = 19,358,101,236.14/128,493.31
  6. Step 6: Final answer
    x = 150,654.55

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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.