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Finding the Fourth Proportional to 13,600.90, 18,771.61 and 7,939

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Solution

The fourth proportional to 13,600.90, 18,771.61 and 7,939 is: 10,957.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,600.90 : 18,771.61 = 7,939 : x
  2. Step 2: Convert to fraction form
    13,600.90/18,771.61 = 7,939/x
  3. Step 3: Cross multiply
    13,600.90x = 18,771.61 × 7,939
  4. Step 4: Simplify right side
    13,600.90x = 149,027,811.79
  5. Step 5: Solve for x
    x = 149,027,811.79/13,600.90
  6. Step 6: Final answer
    x = 10,957.20

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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.