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Finding the Fourth Proportional to 7,125.50, 9,833.12 and 3,939

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Solution

The fourth proportional to 7,125.50, 9,833.12 and 3,939 is: 5,435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,125.50 : 9,833.12 = 3,939 : x
  2. Step 2: Convert to fraction form
    7,125.50/9,833.12 = 3,939/x
  3. Step 3: Cross multiply
    7,125.50x = 9,833.12 × 3,939
  4. Step 4: Simplify right side
    7,125.50x = 38,732,659.68
  5. Step 5: Solve for x
    x = 38,732,659.68/7,125.50
  6. Step 6: Final answer
    x = 5,435.78

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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.