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Finding the Fourth Proportional to 103,786.50, 155,679.90 and 28,906.86

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Solution

The fourth proportional to 103,786.50, 155,679.90 and 28,906.86 is: 43,360.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,786.50 : 155,679.90 = 28,906.86 : x
  2. Step 2: Convert to fraction form
    103,786.50/155,679.90 = 28,906.86/x
  3. Step 3: Cross multiply
    103,786.50x = 155,679.90 × 28,906.86
  4. Step 4: Simplify right side
    103,786.50x = 4,500,217,074.11
  5. Step 5: Solve for x
    x = 4,500,217,074.11/103,786.50
  6. Step 6: Final answer
    x = 43,360.33

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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.