Home / 128,786.20-177,724.96-72,197.58

Finding the Fourth Proportional to 128,786.20, 177,724.96 and 72,197.58

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Solution

The fourth proportional to 128,786.20, 177,724.96 and 72,197.58 is: 99,632.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,786.20 : 177,724.96 = 72,197.58 : x
  2. Step 2: Convert to fraction form
    128,786.20/177,724.96 = 72,197.58/x
  3. Step 3: Cross multiply
    128,786.20x = 177,724.96 × 72,197.58
  4. Step 4: Simplify right side
    128,786.20x = 12,831,311,706.92
  5. Step 5: Solve for x
    x = 12,831,311,706.92/128,786.20
  6. Step 6: Final answer
    x = 99,632.66

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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.