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Finding the Fourth Proportional to 10,872.70, 15,007.89 and 9,921.22

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Solution

The fourth proportional to 10,872.70, 15,007.89 and 9,921.22 is: 13,694.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,872.70 : 15,007.89 = 9,921.22 : x
  2. Step 2: Convert to fraction form
    10,872.70/15,007.89 = 9,921.22/x
  3. Step 3: Cross multiply
    10,872.70x = 15,007.89 × 9,921.22
  4. Step 4: Simplify right side
    10,872.70x = 148,896,578.43
  5. Step 5: Solve for x
    x = 148,896,578.43/10,872.70
  6. Step 6: Final answer
    x = 13,694.54

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Why These Related Problems?

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