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Finding the Fourth Proportional to 122,508.72, 169,072.92 and 72,198

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Solution

The fourth proportional to 122,508.72, 169,072.92 and 72,198 is: 99,639.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,508.72 : 169,072.92 = 72,198 : x
  2. Step 2: Convert to fraction form
    122,508.72/169,072.92 = 72,198/x
  3. Step 3: Cross multiply
    122,508.72x = 169,072.92 × 72,198
  4. Step 4: Simplify right side
    122,508.72x = 12,206,726,678.16
  5. Step 5: Solve for x
    x = 12,206,726,678.16/122,508.72
  6. Step 6: Final answer
    x = 99,639.66

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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.