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Finding the Fourth Proportional to 66,447.76, 91,687.44 and 39,589.60

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Solution

The fourth proportional to 66,447.76, 91,687.44 and 39,589.60 is: 54,627.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,447.76 : 91,687.44 = 39,589.60 : x
  2. Step 2: Convert to fraction form
    66,447.76/91,687.44 = 39,589.60/x
  3. Step 3: Cross multiply
    66,447.76x = 91,687.44 × 39,589.60
  4. Step 4: Simplify right side
    66,447.76x = 3,629,869,074.62
  5. Step 5: Solve for x
    x = 3,629,869,074.62/66,447.76
  6. Step 6: Final answer
    x = 54,627.41

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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.