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Finding the Fourth Proportional to 171,919.40, 257,660.40 and 82,981.40

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Solution

The fourth proportional to 171,919.40, 257,660.40 and 82,981.40 is: 124,366.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,919.40 : 257,660.40 = 82,981.40 : x
  2. Step 2: Convert to fraction form
    171,919.40/257,660.40 = 82,981.40/x
  3. Step 3: Cross multiply
    171,919.40x = 257,660.40 × 82,981.40
  4. Step 4: Simplify right side
    171,919.40x = 21,381,020,716.56
  5. Step 5: Solve for x
    x = 21,381,020,716.56/171,919.40
  6. Step 6: Final answer
    x = 124,366.54

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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.