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Finding the Fourth Proportional to 85,992.72, 128,939.26 and 33,340.56

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Solution

The fourth proportional to 85,992.72, 128,939.26 and 33,340.56 is: 49,991.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,992.72 : 128,939.26 = 33,340.56 : x
  2. Step 2: Convert to fraction form
    85,992.72/128,939.26 = 33,340.56/x
  3. Step 3: Cross multiply
    85,992.72x = 128,939.26 × 33,340.56
  4. Step 4: Simplify right side
    85,992.72x = 4,298,907,134.39
  5. Step 5: Solve for x
    x = 4,298,907,134.39/85,992.72
  6. Step 6: Final answer
    x = 49,991.52

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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.