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Finding the Fourth Proportional to 18,711, 25,811.87 and 13,057.61

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Solution

The fourth proportional to 18,711, 25,811.87 and 13,057.61 is: 18,012.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711 : 25,811.87 = 13,057.61 : x
  2. Step 2: Convert to fraction form
    18,711/25,811.87 = 13,057.61/x
  3. Step 3: Cross multiply
    18,711x = 25,811.87 × 13,057.61
  4. Step 4: Simplify right side
    18,711x = 337,041,137.48
  5. Step 5: Solve for x
    x = 337,041,137.48/18,711
  6. Step 6: Final answer
    x = 18,012.99

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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.