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Finding the Fourth Proportional to 18,651.81, 25,731.41 and 10,692.21

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Solution

The fourth proportional to 18,651.81, 25,731.41 and 10,692.21 is: 14,750.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.81 : 25,731.41 = 10,692.21 : x
  2. Step 2: Convert to fraction form
    18,651.81/25,731.41 = 10,692.21/x
  3. Step 3: Cross multiply
    18,651.81x = 25,731.41 × 10,692.21
  4. Step 4: Simplify right side
    18,651.81x = 275,125,585.86
  5. Step 5: Solve for x
    x = 275,125,585.86/18,651.81
  6. Step 6: Final answer
    x = 14,750.61

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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.