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Finding the Fourth Proportional to 129,879.66, 179,232.16 and 72,519.87

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Solution

The fourth proportional to 129,879.66, 179,232.16 and 72,519.87 is: 100,076.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,879.66 : 179,232.16 = 72,519.87 : x
  2. Step 2: Convert to fraction form
    129,879.66/179,232.16 = 72,519.87/x
  3. Step 3: Cross multiply
    129,879.66x = 179,232.16 × 72,519.87
  4. Step 4: Simplify right side
    129,879.66x = 12,997,892,943.02
  5. Step 5: Solve for x
    x = 12,997,892,943.02/129,879.66
  6. Step 6: Final answer
    x = 100,076.43

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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.