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Finding the Fourth Proportional to 129,694.86, 179,062.21 and 81,363.05

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Solution

The fourth proportional to 129,694.86, 179,062.21 and 81,363.05 is: 112,333.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,694.86 : 179,062.21 = 81,363.05 : x
  2. Step 2: Convert to fraction form
    129,694.86/179,062.21 = 81,363.05/x
  3. Step 3: Cross multiply
    129,694.86x = 179,062.21 × 81,363.05
  4. Step 4: Simplify right side
    129,694.86x = 14,569,047,835.38
  5. Step 5: Solve for x
    x = 14,569,047,835.38/129,694.86
  6. Step 6: Final answer
    x = 112,333.27

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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.