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Finding the Fourth Proportional to 18,761.87, 25,891.37 and 10,805.63

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Solution

The fourth proportional to 18,761.87, 25,891.37 and 10,805.63 is: 14,911.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.87 : 25,891.37 = 10,805.63 : x
  2. Step 2: Convert to fraction form
    18,761.87/25,891.37 = 10,805.63/x
  3. Step 3: Cross multiply
    18,761.87x = 25,891.37 × 10,805.63
  4. Step 4: Simplify right side
    18,761.87x = 279,772,380.93
  5. Step 5: Solve for x
    x = 279,772,380.93/18,761.87
  6. Step 6: Final answer
    x = 14,911.76

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1.5x scale

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.