Home / 18,921.72-28,393.92-7,828.56

Finding the Fourth Proportional to 18,921.72, 28,393.92 and 7,828.56

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Solution

The fourth proportional to 18,921.72, 28,393.92 and 7,828.56 is: 11,747.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.72 : 28,393.92 = 7,828.56 : x
  2. Step 2: Convert to fraction form
    18,921.72/28,393.92 = 7,828.56/x
  3. Step 3: Cross multiply
    18,921.72x = 28,393.92 × 7,828.56
  4. Step 4: Simplify right side
    18,921.72x = 222,283,506.36
  5. Step 5: Solve for x
    x = 222,283,506.36/18,921.72
  6. Step 6: Final answer
    x = 11,747.53

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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.