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Finding the Fourth Proportional to 18,618.45, 27,918.91 and 6,763.87

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Solution

The fourth proportional to 18,618.45, 27,918.91 and 6,763.87 is: 10,142.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,618.45 : 27,918.91 = 6,763.87 : x
  2. Step 2: Convert to fraction form
    18,618.45/27,918.91 = 6,763.87/x
  3. Step 3: Cross multiply
    18,618.45x = 27,918.91 × 6,763.87
  4. Step 4: Simplify right side
    18,618.45x = 188,839,877.78
  5. Step 5: Solve for x
    x = 188,839,877.78/18,618.45
  6. Step 6: Final answer
    x = 10,142.62

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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.