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Finding the Fourth Proportional to 128,609.86, 177,481.26 and 71,249.29

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Solution

The fourth proportional to 128,609.86, 177,481.26 and 71,249.29 is: 98,323.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.86 : 177,481.26 = 71,249.29 : x
  2. Step 2: Convert to fraction form
    128,609.86/177,481.26 = 71,249.29/x
  3. Step 3: Cross multiply
    128,609.86x = 177,481.26 × 71,249.29
  4. Step 4: Simplify right side
    128,609.86x = 12,645,413,763.31
  5. Step 5: Solve for x
    x = 12,645,413,763.31/128,609.86
  6. Step 6: Final answer
    x = 98,323.83

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1.5x scale

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.