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Finding the Fourth Proportional to 165,221.80, 247,659.42 and 80,865.64

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Solution

The fourth proportional to 165,221.80, 247,659.42 and 80,865.64 is: 121,213.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,221.80 : 247,659.42 = 80,865.64 : x
  2. Step 2: Convert to fraction form
    165,221.80/247,659.42 = 80,865.64/x
  3. Step 3: Cross multiply
    165,221.80x = 247,659.42 × 80,865.64
  4. Step 4: Simplify right side
    165,221.80x = 20,027,137,500.33
  5. Step 5: Solve for x
    x = 20,027,137,500.33/165,221.80
  6. Step 6: Final answer
    x = 121,213.65

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1.5x scale

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.