Home / 13,578.28-18,738.76-7,611.86

Finding the Fourth Proportional to 13,578.28, 18,738.76 and 7,611.86

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Solution

The fourth proportional to 13,578.28, 18,738.76 and 7,611.86 is: 10,504.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,578.28 : 18,738.76 = 7,611.86 : x
  2. Step 2: Convert to fraction form
    13,578.28/18,738.76 = 7,611.86/x
  3. Step 3: Cross multiply
    13,578.28x = 18,738.76 × 7,611.86
  4. Step 4: Simplify right side
    13,578.28x = 142,636,817.69
  5. Step 5: Solve for x
    x = 142,636,817.69/13,578.28
  6. Step 6: Final answer
    x = 10,504.78

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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.