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Finding the Fourth Proportional to 43,805.90, 65,731.80 and 20,120.60

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Solution

The fourth proportional to 43,805.90, 65,731.80 and 20,120.60 is: 30,191.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,805.90 : 65,731.80 = 20,120.60 : x
  2. Step 2: Convert to fraction form
    43,805.90/65,731.80 = 20,120.60/x
  3. Step 3: Cross multiply
    43,805.90x = 65,731.80 × 20,120.60
  4. Step 4: Simplify right side
    43,805.90x = 1,322,563,255.08
  5. Step 5: Solve for x
    x = 1,322,563,255.08/43,805.90
  6. Step 6: Final answer
    x = 30,191.44

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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.