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Finding the Fourth Proportional to 136,955.12, 205,149.68 and 80,621.64

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Solution

The fourth proportional to 136,955.12, 205,149.68 and 80,621.64 is: 120,765.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,955.12 : 205,149.68 = 80,621.64 : x
  2. Step 2: Convert to fraction form
    136,955.12/205,149.68 = 80,621.64/x
  3. Step 3: Cross multiply
    136,955.12x = 205,149.68 × 80,621.64
  4. Step 4: Simplify right side
    136,955.12x = 16,539,503,647.08
  5. Step 5: Solve for x
    x = 16,539,503,647.08/136,955.12
  6. Step 6: Final answer
    x = 120,765.87

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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.