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Finding the Fourth Proportional to 45,073.72, 67,611.60 and 13,909

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Solution

The fourth proportional to 45,073.72, 67,611.60 and 13,909 is: 20,863.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,073.72 : 67,611.60 = 13,909 : x
  2. Step 2: Convert to fraction form
    45,073.72/67,611.60 = 13,909/x
  3. Step 3: Cross multiply
    45,073.72x = 67,611.60 × 13,909
  4. Step 4: Simplify right side
    45,073.72x = 940,409,744.40
  5. Step 5: Solve for x
    x = 940,409,744.40/45,073.72
  6. Step 6: Final answer
    x = 20,863.81

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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.