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Finding the Fourth Proportional to 85,105.78, 127,621.72 and 28,930.78

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Solution

The fourth proportional to 85,105.78, 127,621.72 and 28,930.78 is: 43,383.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,105.78 : 127,621.72 = 28,930.78 : x
  2. Step 2: Convert to fraction form
    85,105.78/127,621.72 = 28,930.78/x
  3. Step 3: Cross multiply
    85,105.78x = 127,621.72 × 28,930.78
  4. Step 4: Simplify right side
    85,105.78x = 3,692,195,904.54
  5. Step 5: Solve for x
    x = 3,692,195,904.54/85,105.78
  6. Step 6: Final answer
    x = 43,383.61

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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.