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Finding the Fourth Proportional to 18,871.82, 28,315.49 and 8,336.28

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Solution

The fourth proportional to 18,871.82, 28,315.49 and 8,336.28 is: 12,507.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.82 : 28,315.49 = 8,336.28 : x
  2. Step 2: Convert to fraction form
    18,871.82/28,315.49 = 8,336.28/x
  3. Step 3: Cross multiply
    18,871.82x = 28,315.49 × 8,336.28
  4. Step 4: Simplify right side
    18,871.82x = 236,045,811.30
  5. Step 5: Solve for x
    x = 236,045,811.30/18,871.82
  6. Step 6: Final answer
    x = 12,507.85

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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.