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Finding the Fourth Proportional to 18,391.56, 27,579.15 and 5,240.82

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Solution

The fourth proportional to 18,391.56, 27,579.15 and 5,240.82 is: 7,858.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,391.56 : 27,579.15 = 5,240.82 : x
  2. Step 2: Convert to fraction form
    18,391.56/27,579.15 = 5,240.82/x
  3. Step 3: Cross multiply
    18,391.56x = 27,579.15 × 5,240.82
  4. Step 4: Simplify right side
    18,391.56x = 144,537,360.90
  5. Step 5: Solve for x
    x = 144,537,360.90/18,391.56
  6. Step 6: Final answer
    x = 7,858.90

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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.