Home / 128,380.30-177,165.15-71,791.67

Finding the Fourth Proportional to 128,380.30, 177,165.15 and 71,791.67

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Solution

The fourth proportional to 128,380.30, 177,165.15 and 71,791.67 is: 99,072.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.30 : 177,165.15 = 71,791.67 : x
  2. Step 2: Convert to fraction form
    128,380.30/177,165.15 = 71,791.67/x
  3. Step 3: Cross multiply
    128,380.30x = 177,165.15 × 71,791.67
  4. Step 4: Simplify right side
    128,380.30x = 12,718,981,984.30
  5. Step 5: Solve for x
    x = 12,718,981,984.30/128,380.30
  6. Step 6: Final answer
    x = 99,072.69

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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.