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Finding the Fourth Proportional to 18,138.79, 27,203.32 and 4,991.88

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Solution

The fourth proportional to 18,138.79, 27,203.32 and 4,991.88 is: 7,486.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.79 : 27,203.32 = 4,991.88 : x
  2. Step 2: Convert to fraction form
    18,138.79/27,203.32 = 4,991.88/x
  3. Step 3: Cross multiply
    18,138.79x = 27,203.32 × 4,991.88
  4. Step 4: Simplify right side
    18,138.79x = 135,795,650.24
  5. Step 5: Solve for x
    x = 135,795,650.24/18,138.79
  6. Step 6: Final answer
    x = 7,486.48

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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.