Home / 128,786.55-177,792.20-100,041.81

Finding the Fourth Proportional to 128,786.55, 177,792.20 and 100,041.81

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Solution

The fourth proportional to 128,786.55, 177,792.20 and 100,041.81 is: 138,109.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,786.55 : 177,792.20 = 100,041.81 : x
  2. Step 2: Convert to fraction form
    128,786.55/177,792.20 = 100,041.81/x
  3. Step 3: Cross multiply
    128,786.55x = 177,792.20 × 100,041.81
  4. Step 4: Simplify right side
    128,786.55x = 17,786,653,491.88
  5. Step 5: Solve for x
    x = 17,786,653,491.88/128,786.55
  6. Step 6: Final answer
    x = 138,109.56

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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.