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Finding the Fourth Proportional to 20,661.75, 30,992.63 and 6,810.75

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Solution

The fourth proportional to 20,661.75, 30,992.63 and 6,810.75 is: 10,216.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.75 : 30,992.63 = 6,810.75 : x
  2. Step 2: Convert to fraction form
    20,661.75/30,992.63 = 6,810.75/x
  3. Step 3: Cross multiply
    20,661.75x = 30,992.63 × 6,810.75
  4. Step 4: Simplify right side
    20,661.75x = 211,083,020.72
  5. Step 5: Solve for x
    x = 211,083,020.72/20,661.75
  6. Step 6: Final answer
    x = 10,216.13

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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.