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Finding the Fourth Proportional to 8,939.51, 13,410.21 and 3,318.72

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Solution

The fourth proportional to 8,939.51, 13,410.21 and 3,318.72 is: 4,978.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.51 : 13,410.21 = 3,318.72 : x
  2. Step 2: Convert to fraction form
    8,939.51/13,410.21 = 3,318.72/x
  3. Step 3: Cross multiply
    8,939.51x = 13,410.21 × 3,318.72
  4. Step 4: Simplify right side
    8,939.51x = 44,504,751.05
  5. Step 5: Solve for x
    x = 44,504,751.05/8,939.51
  6. Step 6: Final answer
    x = 4,978.43

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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.