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Finding the Fourth Proportional to 126,981, 175,198.32 and 100,039.89

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Solution

The fourth proportional to 126,981, 175,198.32 and 100,039.89 is: 138,027.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,981 : 175,198.32 = 100,039.89 : x
  2. Step 2: Convert to fraction form
    126,981/175,198.32 = 100,039.89/x
  3. Step 3: Cross multiply
    126,981x = 175,198.32 × 100,039.89
  4. Step 4: Simplify right side
    126,981x = 17,526,820,660.98
  5. Step 5: Solve for x
    x = 17,526,820,660.98/126,981
  6. Step 6: Final answer
    x = 138,027.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.