Home / 128,512.31-177,325.83-80,731.82

Finding the Fourth Proportional to 128,512.31, 177,325.83 and 80,731.82

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Solution

The fourth proportional to 128,512.31, 177,325.83 and 80,731.82 is: 111,396.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.31 : 177,325.83 = 80,731.82 : x
  2. Step 2: Convert to fraction form
    128,512.31/177,325.83 = 80,731.82/x
  3. Step 3: Cross multiply
    128,512.31x = 177,325.83 × 80,731.82
  4. Step 4: Simplify right side
    128,512.31x = 14,315,836,988.91
  5. Step 5: Solve for x
    x = 14,315,836,988.91/128,512.31
  6. Step 6: Final answer
    x = 111,396.62

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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.