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Finding the Fourth Proportional to 18,578.43, 27,880.34 and 7,485.99

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Solution

The fourth proportional to 18,578.43, 27,880.34 and 7,485.99 is: 11,234.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,578.43 : 27,880.34 = 7,485.99 : x
  2. Step 2: Convert to fraction form
    18,578.43/27,880.34 = 7,485.99/x
  3. Step 3: Cross multiply
    18,578.43x = 27,880.34 × 7,485.99
  4. Step 4: Simplify right side
    18,578.43x = 208,711,804.46
  5. Step 5: Solve for x
    x = 208,711,804.46/18,578.43
  6. Step 6: Final answer
    x = 11,234.09

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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.