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Finding the Fourth Proportional to 85,115.20, 127,672.80 and 75,929.80

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Solution

The fourth proportional to 85,115.20, 127,672.80 and 75,929.80 is: 113,894.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,115.20 : 127,672.80 = 75,929.80 : x
  2. Step 2: Convert to fraction form
    85,115.20/127,672.80 = 75,929.80/x
  3. Step 3: Cross multiply
    85,115.20x = 127,672.80 × 75,929.80
  4. Step 4: Simplify right side
    85,115.20x = 9,694,170,169.44
  5. Step 5: Solve for x
    x = 9,694,170,169.44/85,115.20
  6. Step 6: Final answer
    x = 113,894.70

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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.