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Finding the Fourth Proportional to 8,489.30, 12,738.90 and 3,558.51

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Solution

The fourth proportional to 8,489.30, 12,738.90 and 3,558.51 is: 5,339.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,489.30 : 12,738.90 = 3,558.51 : x
  2. Step 2: Convert to fraction form
    8,489.30/12,738.90 = 3,558.51/x
  3. Step 3: Cross multiply
    8,489.30x = 12,738.90 × 3,558.51
  4. Step 4: Simplify right side
    8,489.30x = 45,331,503.04
  5. Step 5: Solve for x
    x = 45,331,503.04/8,489.30
  6. Step 6: Final answer
    x = 5,339.84

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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.