Home / 129,879.12-179,231.43-72,519.33

Finding the Fourth Proportional to 129,879.12, 179,231.43 and 72,519.33

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Solution

The fourth proportional to 129,879.12, 179,231.43 and 72,519.33 is: 100,075.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,879.12 : 179,231.43 = 72,519.33 : x
  2. Step 2: Convert to fraction form
    129,879.12/179,231.43 = 72,519.33/x
  3. Step 3: Cross multiply
    129,879.12x = 179,231.43 × 72,519.33
  4. Step 4: Simplify right side
    129,879.12x = 12,997,743,218.54
  5. Step 5: Solve for x
    x = 12,997,743,218.54/129,879.12
  6. Step 6: Final answer
    x = 100,075.70

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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.