Home / 129,879.11-179,232.41-72,515.12

Finding the Fourth Proportional to 129,879.11, 179,232.41 and 72,515.12

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Solution

The fourth proportional to 129,879.11, 179,232.41 and 72,515.12 is: 100,070.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,879.11 : 179,232.41 = 72,515.12 : x
  2. Step 2: Convert to fraction form
    129,879.11/179,232.41 = 72,515.12/x
  3. Step 3: Cross multiply
    129,879.11x = 179,232.41 × 72,515.12
  4. Step 4: Simplify right side
    129,879.11x = 12,997,059,004.16
  5. Step 5: Solve for x
    x = 12,997,059,004.16/129,879.11
  6. Step 6: Final answer
    x = 100,070.43

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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.