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Finding the Fourth Proportional to 85,274.20, 127,911.30 and 80,435.80

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Solution

The fourth proportional to 85,274.20, 127,911.30 and 80,435.80 is: 120,653.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,274.20 : 127,911.30 = 80,435.80 : x
  2. Step 2: Convert to fraction form
    85,274.20/127,911.30 = 80,435.80/x
  3. Step 3: Cross multiply
    85,274.20x = 127,911.30 × 80,435.80
  4. Step 4: Simplify right side
    85,274.20x = 10,288,647,744.54
  5. Step 5: Solve for x
    x = 10,288,647,744.54/85,274.20
  6. Step 6: Final answer
    x = 120,653.70

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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.