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Finding the Fourth Proportional to 129,909.91, 179,290.80 and 108,067.60

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Solution

The fourth proportional to 129,909.91, 179,290.80 and 108,067.60 is: 149,145.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,909.91 : 179,290.80 = 108,067.60 : x
  2. Step 2: Convert to fraction form
    129,909.91/179,290.80 = 108,067.60/x
  3. Step 3: Cross multiply
    129,909.91x = 179,290.80 × 108,067.60
  4. Step 4: Simplify right side
    129,909.91x = 19,375,525,021.29
  5. Step 5: Solve for x
    x = 19,375,525,021.29/129,909.91
  6. Step 6: Final answer
    x = 149,145.86

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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.