Home / 394,428.10-591,728.55-128,143.30

Finding the Fourth Proportional to 394,428.10, 591,728.55 and 128,143.30

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Solution

The fourth proportional to 394,428.10, 591,728.55 and 128,143.30 is: 192,243.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,428.10 : 591,728.55 = 128,143.30 : x
  2. Step 2: Convert to fraction form
    394,428.10/591,728.55 = 128,143.30/x
  3. Step 3: Cross multiply
    394,428.10x = 591,728.55 × 128,143.30
  4. Step 4: Simplify right side
    394,428.10x = 75,826,049,101.22
  5. Step 5: Solve for x
    x = 75,826,049,101.22/394,428.10
  6. Step 6: Final answer
    x = 192,243.02

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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.