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Finding the Fourth Proportional to 85,676.32, 128,504.71 and 54,183.52

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Solution

The fourth proportional to 85,676.32, 128,504.71 and 54,183.52 is: 81,269.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,676.32 : 128,504.71 = 54,183.52 : x
  2. Step 2: Convert to fraction form
    85,676.32/128,504.71 = 54,183.52/x
  3. Step 3: Cross multiply
    85,676.32x = 128,504.71 × 54,183.52
  4. Step 4: Simplify right side
    85,676.32x = 6,962,837,524.38
  5. Step 5: Solve for x
    x = 6,962,837,524.38/85,676.32
  6. Step 6: Final answer
    x = 81,269.10

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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.