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Finding the Fourth Proportional to 91,894.60, 137,845.41 and 28,720.54

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Solution

The fourth proportional to 91,894.60, 137,845.41 and 28,720.54 is: 43,081.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,894.60 : 137,845.41 = 28,720.54 : x
  2. Step 2: Convert to fraction form
    91,894.60/137,845.41 = 28,720.54/x
  3. Step 3: Cross multiply
    91,894.60x = 137,845.41 × 28,720.54
  4. Step 4: Simplify right side
    91,894.60x = 3,958,994,611.72
  5. Step 5: Solve for x
    x = 3,958,994,611.72/91,894.60
  6. Step 6: Final answer
    x = 43,081.91

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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.