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Finding the Fourth Proportional to 13,679.60, 20,490.60 and 11,375.60

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Solution

The fourth proportional to 13,679.60, 20,490.60 and 11,375.60 is: 17,039.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.60 : 20,490.60 = 11,375.60 : x
  2. Step 2: Convert to fraction form
    13,679.60/20,490.60 = 11,375.60/x
  3. Step 3: Cross multiply
    13,679.60x = 20,490.60 × 11,375.60
  4. Step 4: Simplify right side
    13,679.60x = 233,092,869.36
  5. Step 5: Solve for x
    x = 233,092,869.36/13,679.60
  6. Step 6: Final answer
    x = 17,039.45

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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.