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Finding the Fourth Proportional to 21,007.97, 28,990.86 and 11,576.54

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Solution

The fourth proportional to 21,007.97, 28,990.86 and 11,576.54 is: 15,975.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.97 : 28,990.86 = 11,576.54 : x
  2. Step 2: Convert to fraction form
    21,007.97/28,990.86 = 11,576.54/x
  3. Step 3: Cross multiply
    21,007.97x = 28,990.86 × 11,576.54
  4. Step 4: Simplify right side
    21,007.97x = 335,613,781.53
  5. Step 5: Solve for x
    x = 335,613,781.53/21,007.97
  6. Step 6: Final answer
    x = 15,975.54

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.