Home / 129,789.87-179,109.68-72,428.58

Finding the Fourth Proportional to 129,789.87, 179,109.68 and 72,428.58

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Solution

The fourth proportional to 129,789.87, 179,109.68 and 72,428.58 is: 99,951.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,789.87 : 179,109.68 = 72,428.58 : x
  2. Step 2: Convert to fraction form
    129,789.87/179,109.68 = 72,428.58/x
  3. Step 3: Cross multiply
    129,789.87x = 179,109.68 × 72,428.58
  4. Step 4: Simplify right side
    129,789.87x = 12,972,659,786.65
  5. Step 5: Solve for x
    x = 12,972,659,786.65/129,789.87
  6. Step 6: Final answer
    x = 99,951.25

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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.