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Finding the Fourth Proportional to 18,761.87, 25,880.10 and 12,388.52

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Solution

The fourth proportional to 18,761.87, 25,880.10 and 12,388.52 is: 17,088.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.87 : 25,880.10 = 12,388.52 : x
  2. Step 2: Convert to fraction form
    18,761.87/25,880.10 = 12,388.52/x
  3. Step 3: Cross multiply
    18,761.87x = 25,880.10 × 12,388.52
  4. Step 4: Simplify right side
    18,761.87x = 320,616,136.45
  5. Step 5: Solve for x
    x = 320,616,136.45/18,761.87
  6. Step 6: Final answer
    x = 17,088.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.