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Finding the Fourth Proportional to 85,769.78, 128,630.25 and 54,132.48

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Solution

The fourth proportional to 85,769.78, 128,630.25 and 54,132.48 is: 81,183.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,769.78 : 128,630.25 = 54,132.48 : x
  2. Step 2: Convert to fraction form
    85,769.78/128,630.25 = 54,132.48/x
  3. Step 3: Cross multiply
    85,769.78x = 128,630.25 × 54,132.48
  4. Step 4: Simplify right side
    85,769.78x = 6,963,074,435.52
  5. Step 5: Solve for x
    x = 6,963,074,435.52/85,769.78
  6. Step 6: Final answer
    x = 81,183.31

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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.