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Finding the Fourth Proportional to 12,661.14, 18,999.87 and 6,821.82

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Solution

The fourth proportional to 12,661.14, 18,999.87 and 6,821.82 is: 10,237.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.14 : 18,999.87 = 6,821.82 : x
  2. Step 2: Convert to fraction form
    12,661.14/18,999.87 = 6,821.82/x
  3. Step 3: Cross multiply
    12,661.14x = 18,999.87 × 6,821.82
  4. Step 4: Simplify right side
    12,661.14x = 129,613,693.16
  5. Step 5: Solve for x
    x = 129,613,693.16/12,661.14
  6. Step 6: Final answer
    x = 10,237.13

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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.