Home / 128,330.09-192,018.38-80,722.88

Finding the Fourth Proportional to 128,330.09, 192,018.38 and 80,722.88

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Solution

The fourth proportional to 128,330.09, 192,018.38 and 80,722.88 is: 120,784.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,330.09 : 192,018.38 = 80,722.88 : x
  2. Step 2: Convert to fraction form
    128,330.09/192,018.38 = 80,722.88/x
  3. Step 3: Cross multiply
    128,330.09x = 192,018.38 × 80,722.88
  4. Step 4: Simplify right side
    128,330.09x = 15,500,275,282.83
  5. Step 5: Solve for x
    x = 15,500,275,282.83/128,330.09
  6. Step 6: Final answer
    x = 120,784.42

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1.5x scale

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.