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Finding the Fourth Proportional to 39,389.04, 54,375 and 33,990

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Solution

The fourth proportional to 39,389.04, 54,375 and 33,990 is: 46,921.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,389.04 : 54,375 = 33,990 : x
  2. Step 2: Convert to fraction form
    39,389.04/54,375 = 33,990/x
  3. Step 3: Cross multiply
    39,389.04x = 54,375 × 33,990
  4. Step 4: Simplify right side
    39,389.04x = 1,848,206,250
  5. Step 5: Solve for x
    x = 1,848,206,250/39,389.04
  6. Step 6: Final answer
    x = 46,921.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.