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Finding the Fourth Proportional to 263,138.82, 394,615.08 and 85,612.74

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Solution

The fourth proportional to 263,138.82, 394,615.08 and 85,612.74 is: 128,388.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,138.82 : 394,615.08 = 85,612.74 : x
  2. Step 2: Convert to fraction form
    263,138.82/394,615.08 = 85,612.74/x
  3. Step 3: Cross multiply
    263,138.82x = 394,615.08 × 85,612.74
  4. Step 4: Simplify right side
    263,138.82x = 33,784,078,244.12
  5. Step 5: Solve for x
    x = 33,784,078,244.12/263,138.82
  6. Step 6: Final answer
    x = 128,388.80

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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.