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Finding the Fourth Proportional to 6,669.80, 9,991.90 and 3,930.60

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Solution

The fourth proportional to 6,669.80, 9,991.90 and 3,930.60 is: 5,888.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,669.80 : 9,991.90 = 3,930.60 : x
  2. Step 2: Convert to fraction form
    6,669.80/9,991.90 = 3,930.60/x
  3. Step 3: Cross multiply
    6,669.80x = 9,991.90 × 3,930.60
  4. Step 4: Simplify right side
    6,669.80x = 39,274,162.14
  5. Step 5: Solve for x
    x = 39,274,162.14/6,669.80
  6. Step 6: Final answer
    x = 5,888.36

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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.