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Finding the Fourth Proportional to 85,103.78, 127,618.72 and 28,928.78

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Solution

The fourth proportional to 85,103.78, 127,618.72 and 28,928.78 is: 43,380.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,103.78 : 127,618.72 = 28,928.78 : x
  2. Step 2: Convert to fraction form
    85,103.78/127,618.72 = 28,928.78/x
  3. Step 3: Cross multiply
    85,103.78x = 127,618.72 × 28,928.78
  4. Step 4: Simplify right side
    85,103.78x = 3,691,853,874.76
  5. Step 5: Solve for x
    x = 3,691,853,874.76/85,103.78
  6. Step 6: Final answer
    x = 43,380.61

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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.