Home / 205,198.55-283,178.78-128,720.87

Finding the Fourth Proportional to 205,198.55, 283,178.78 and 128,720.87

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Solution

The fourth proportional to 205,198.55, 283,178.78 and 128,720.87 is: 177,637.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,198.55 : 283,178.78 = 128,720.87 : x
  2. Step 2: Convert to fraction form
    205,198.55/283,178.78 = 128,720.87/x
  3. Step 3: Cross multiply
    205,198.55x = 283,178.78 × 128,720.87
  4. Step 4: Simplify right side
    205,198.55x = 36,451,019,956.89
  5. Step 5: Solve for x
    x = 36,451,019,956.89/205,198.55
  6. Step 6: Final answer
    x = 177,637.81

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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.