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Finding the Fourth Proportional to 262,912.80, 394,369.20 and 85,425.60

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Solution

The fourth proportional to 262,912.80, 394,369.20 and 85,425.60 is: 128,138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,912.80 : 394,369.20 = 85,425.60 : x
  2. Step 2: Convert to fraction form
    262,912.80/394,369.20 = 85,425.60/x
  3. Step 3: Cross multiply
    262,912.80x = 394,369.20 × 85,425.60
  4. Step 4: Simplify right side
    262,912.80x = 33,689,225,531.52
  5. Step 5: Solve for x
    x = 33,689,225,531.52/262,912.80
  6. Step 6: Final answer
    x = 128,138.40

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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.