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Finding the Fourth Proportional to 7,134.45, 9,845.54 and 3,990.65

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Solution

The fourth proportional to 7,134.45, 9,845.54 and 3,990.65 is: 5,507.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,134.45 : 9,845.54 = 3,990.65 : x
  2. Step 2: Convert to fraction form
    7,134.45/9,845.54 = 3,990.65/x
  3. Step 3: Cross multiply
    7,134.45x = 9,845.54 × 3,990.65
  4. Step 4: Simplify right side
    7,134.45x = 39,290,035.02
  5. Step 5: Solve for x
    x = 39,290,035.02/7,134.45
  6. Step 6: Final answer
    x = 5,507.09

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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.