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Finding the Fourth Proportional to 263,297.60, 394,984.80 and 85,812.80

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Solution

The fourth proportional to 263,297.60, 394,984.80 and 85,812.80 is: 128,731.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,297.60 : 394,984.80 = 85,812.80 : x
  2. Step 2: Convert to fraction form
    263,297.60/394,984.80 = 85,812.80/x
  3. Step 3: Cross multiply
    263,297.60x = 394,984.80 × 85,812.80
  4. Step 4: Simplify right side
    263,297.60x = 33,894,751,645.44
  5. Step 5: Solve for x
    x = 33,894,751,645.44/263,297.60
  6. Step 6: Final answer
    x = 128,731.72

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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.