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Finding the Fourth Proportional to 18,751.79, 28,135.44 and 8,216.37

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Solution

The fourth proportional to 18,751.79, 28,135.44 and 8,216.37 is: 12,327.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.79 : 28,135.44 = 8,216.37 : x
  2. Step 2: Convert to fraction form
    18,751.79/28,135.44 = 8,216.37/x
  3. Step 3: Cross multiply
    18,751.79x = 28,135.44 × 8,216.37
  4. Step 4: Simplify right side
    18,751.79x = 231,171,185.15
  5. Step 5: Solve for x
    x = 231,171,185.15/18,751.79
  6. Step 6: Final answer
    x = 12,327.96

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1.5x scale

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.