Home / 128,738.97-177,675.53-80,991.29

Finding the Fourth Proportional to 128,738.97, 177,675.53 and 80,991.29

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Solution

The fourth proportional to 128,738.97, 177,675.53 and 80,991.29 is: 111,777.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,738.97 : 177,675.53 = 80,991.29 : x
  2. Step 2: Convert to fraction form
    128,738.97/177,675.53 = 80,991.29/x
  3. Step 3: Cross multiply
    128,738.97x = 177,675.53 × 80,991.29
  4. Step 4: Simplify right side
    128,738.97x = 14,390,170,415.37
  5. Step 5: Solve for x
    x = 14,390,170,415.37/128,738.97
  6. Step 6: Final answer
    x = 111,777.89

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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.