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Finding the Fourth Proportional to 6,661.29, 9,990.99 and 4,188.54

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Solution

The fourth proportional to 6,661.29, 9,990.99 and 4,188.54 is: 6,282.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,661.29 : 9,990.99 = 4,188.54 : x
  2. Step 2: Convert to fraction form
    6,661.29/9,990.99 = 4,188.54/x
  3. Step 3: Cross multiply
    6,661.29x = 9,990.99 × 4,188.54
  4. Step 4: Simplify right side
    6,661.29x = 41,847,661.25
  5. Step 5: Solve for x
    x = 41,847,661.25/6,661.29
  6. Step 6: Final answer
    x = 6,282.22

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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.